LENACAPAVIR: 502 Adverse Event Reports & Safety Profile

SUNLENCA tablets and SUNLENCA injection contain lenacapavir sodium, a capsid inhibitor. The chemical name of lenacapavir sodium is: Sodium (4-chloro-7-(2-(( S )-1-(2-((3b S ,4a R )-5,5-difluoro-3-(trifluoromethyl)-3b,4,4a,5-tetrahydro-1 H -cyclopropa[3,4]cyclopenta[1,2- c ]pyrazol-1-yl)acetamido)-2-(3,5-difluorophenyl)ethyl)-6-(3-methyl-3-(methylsulfonyl)but-1-yn-1-yl)pyridin-3-yl)-1-(2,2,2-trifluoroethyl)-1 H -indazol-3-yl)(methylsulfonyl)amide. Lenacapavir sodium has a molecular formula of C 39 H 31 ClF 10 N 7 NaO 5 S 2, a molecular weight of 990.3, and the following structural formula: Lenacapavir sodium is a light yellow to yellow solid and is practically insoluble in water.

Chemical

Structure SUNLENCA tablets are for oral administration. Each film-coated tablet contains 300 mg of lenacapavir (present as 306.8 mg lenacapavir sodium) and the following inactive ingredients: copovidone, croscarmellose sodium, magnesium stearate, mannitol, microcrystalline cellulose, and poloxamer 407. The tablets are film-coated with a coating material containing iron oxide black, iron oxide red, iron oxide yellow, polyethylene glycol, polyvinyl alcohol, talc, and titanium dioxide. SUNLENCA injection is for subcutaneous administration. Each single-dose vial contains 463.5 mg/1.5 mL (309 mg/mL) of lenacapavir (present as 473.1 mg/1.5 mL of lenacapavir sodium) as a sterile, preservative-free, clear, yellow solution and the following inactive ingredients: 896.3 mg of polyethylene glycol 300 (as solvent) and water for injection. The apparent pH range of the injection is 9.0–10.2. The vial stoppers are not made with natural rubber latex.

AND USAGE YEZTUGO is indicated for pre‑exposure prophylaxis (PrEP) to reduce the risk of sexually acquired HIV-1 in adults and adolescents weighing at least 35 kg who are at risk for HIV-1 acquisition. Individuals must have a negative HIV-1 test prior to initiating YEZTUGO [see Dosage and Administration (2.1) and Warnings and Precautions (5.1) ]. YEZTUGO, a human immunodeficiency virus type 1 (HIV-1) capsid inhibitor, is indicated for pre‑exposure prophylaxis (PrEP) to reduce the risk of sexually acquired HIV-1 in adults and adolescents weighing at least 35 kg who are at risk for HIV-1 acquisition. Individuals must have a negative HIV-1 test prior to initiating YEZTUGO. ( 1 )

AND ADMINISTRATION HIV-1 screening: Screen all individuals for HIV-1 infection prior to initiating YEZTUGO, prior to each injection of YEZTUGO, and additionally as clinically appropriate. ( 2.1 ) Dosing schedule: Initiation dosing (injection and tablets) followed by once every 6-months continuation injection dosing. Tablets may be taken without regard to food. ( 2.3 )

Initiation Day

1 927 mg by subcutaneous injection (2 x 1.5 mL injections) and 600 mg orally (2 x 300 mg tablets)

Day

2 600 mg orally (2 x 300 mg tablets)

Continuation

927 mg by subcutaneous injection (2 x 1.5 mL injections) every 6-months (26 weeks) from the date of the last injection +/-2 weeks. Anticipated delayed injections: If scheduled injection is anticipated to be delayed by more than 2 weeks, YEZTUGO tablets may be used on an interim basis (for up to 6 months if needed) until injections resume. Dosing schedule for delayed injection is 300 mg orally once every 7 days. ( 2.4 ) Missed injections: If more than 28 weeks have elapsed since the last injection and tablets have not been taken, restart initiation from Day 1 if clinically appropriate. ( 2.4 ) Dosage modifications (supplemental doses) of YEZTUGO are recommended when initiating strong or moderate CYP3A inducers. ( 2.5 ) YEZTUGO injection is for subcutaneous administration only.

Two

1.5 mL injections are required for complete dose. ( 2.6 )

2.1 HIV-1 Screening for Individuals Receiving YEZTUGO for HIV-1 Pre-Exposure Prophylaxis Screen all individuals for HIV-1 infection prior to initiating YEZTUGO, prior to each subsequent injection of YEZTUGO, and additionally as clinically appropriate, using a test approved or cleared by the FDA for the diagnosis of acute or primary HIV-1 infection. When screening for HIV-1 infection prior to initiating YEZTUGO, if an antigen/antibody-specific test is used and provides negative results, then such negative results should be confirmed using an RNA-specific assay, even if the results of the RNA-assay are available after YEZTUGO initiation. When screening for HIV-1 infection prior to continuing YEZTUGO, negative results from a rapid, point-of-care antigen/antibody test should be confirmed using a more sensitive assay <span class="opacity-50 text-xs">[see Indications and Usage (1) , Contraindications (4) , Warnings and Precautions (5.1 , 5.2) and Clinical Studies (14) ]</span>.

2.2 Adherence to YEZTUGO Prior to starting YEZTUGO, healthcare providers should select individuals who agree to the required testing and every 6 month injection dosing schedule, and counsel individuals about the importance of adherence to scheduled YEZTUGO dosing visits to help reduce the risk of acquiring HIV-1 infection and development of resistance <span class="opacity-50 text-xs">[see Dosage and Administration (2.1) , Warnings and Precautions (5.1 , 5.2) , and Microbiology (12.4) ]</span> .

2.3 Recommended Dosage The YEZTUGO dosing schedule in adults and adolescents weighing at least 35 kg consists of a required initiation dosing (subcutaneous injections and oral tablets) followed by once every 6-months continuation dosing (subcutaneous injections) ( Table 1 ). YEZTUGO oral tablets may be taken with or without food <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span> .

Table

1.

Dosing

Schedule for YEZTUGO Initiation and Continuation in Adults and Adolescents Weighing at Least 35 kg Time Dosage of YEZTUGO: Initiation The complete initiation dosing schedule, consisting of subcutaneous injections and oral tablets, is required; the efficacy of YEZTUGO has only been established with this dosing schedule.

Day

1 927 mg by subcutaneous injection (2 x 1.5 mL injections) and 600 mg orally (2 x 300 mg tablets)

Day

2 600 mg orally (2 x 300 mg tablets) Dosage of YEZTUGO: Continuation Every 6-months (26 weeks) From the date of the last injection. +/-2 weeks 927 mg by subcutaneous injection (2 x 1.5 mL injections)

2.4 Dosing Schedule for Missed Dose Missed Oral Initiation Dose If the Day 2 oral initiation dose (600 mg; see Table 1 ) is missed, take it as soon as possible. Do not take Day 1 and Day 2 oral initiation doses on the same day.

Anticipated Delayed Injections

During continuation dosing, if the scheduled 6-month injection is anticipated to be delayed by more than 2 weeks, YEZTUGO tablets may be taken on an interim basis (for up to 6 months if needed), until injections resume. Refer to Table 2 below for the dosing schedule for delayed injections.

Table

2.

Dosing

Schedule for Anticipated Delayed Injections: Weekly Oral Dosage Time since Last Injection Dosage of YEZTUGO 26 to 28 weeks Oral dosage of 300 mg taken once every 7 days. Use on an interim basis only (for up to 6 months if needed). Resume the continuation injection dosage within 7 days after the last oral dose.

Missed Injections

Individuals who miss a scheduled injection visit should be clinically reassessed to ensure resumption of YEZTUGO remains appropriate and that the individual remains HIV-1 negative. During continuation dosing, if more than 28 weeks have elapsed since the last injection and YEZTUGO tablets have not been taken, see Table 3 below for the dosing schedule after missed injections. Adherence to the injection dosing schedule is strongly recommended [see Dosage and Administration (2.2) and Microbiology (12.4) ].

Table

3.

Dosing

Schedule after Missed Injections Time since Last Injection Dosage of YEZTUGO More than 28 weeks Reinitiate with initiation dosing schedule from Day 1 ( Table 1 ) and then continue with continuation injection dosing.

2.5 Dosage Modifications for Co-administration with Strong or Moderate CYP3A Inducers Supplemental doses of YEZTUGO are recommended for individuals initiating therapy with either strong CYP3A inducers (see Table 4 ) or moderate CYP3A inducers (see Table 5 ) <span class="opacity-50 text-xs">[see Drug Interactions (7.1) and Clinical Pharmacology (12.3) ]</span> . Strong CYP3A inducers may be initiated starting at least 2 days after YEZTUGO is first initiated, while moderate CYP3A inducers may be started any time after YEZTUGO is first initiated.

Table

4.

Dosing

Recommendations for Individuals Receiving YEZTUGO and Initiating Therapy with Strong CYP3A Inducers Dosing recommendations are not available for the initiation of YEZTUGO in individuals already receiving strong CYP3A inducers, nor in individuals receiving the weekly oral dosage of YEZTUGO (see Table 2 ) .

Maintain Scheduled Continuation Injection Dosing

Schedule for Supplemental Doses of YEZTUGO Time Dosage Continue to administer once every 6-months scheduled continuation dosing of YEZTUGO 927 mg subcutaneously (2 x 1.5 mL injections) (see Table 1 ), plus administer supplemental doses of YEZTUGO as shown in this table On day strong CYP3A inducer is initiated (which should be at least 2 days after YEZTUGO is first initiated) Supplemental dosage: Step 1 927 mg subcutaneously (2 x 1.5 mL injections) and 600 mg orally (2 x 300 mg tablets) On day after strong CYP3A inducer is initiated Supplemental dosage: Step 2 600 mg orally (2 x 300 mg tablets) If strong CYP3A inducer is co-administered for longer than 6 months Subsequent supplemental dosage Every 6-months 26 weeks +/-2 weeks. from initiation of strong CYP3A inducer, continue to administer supplemental doses of YEZTUGO as described above in Steps 1 and 2. After stopping the strong CYP3A inducer, continue the once every 6-months scheduled continuation injection dosing of YEZTUGO (see Table 1 ) .

Table

5.

Dosing

Recommendations for Individuals Receiving YEZTUGO and Initiating Therapy with Moderate CYP3A Inducers Dosing recommendations are not available for the initiation of YEZTUGO in individuals already receiving moderate CYP3A inducers, nor in individuals receiving the weekly oral dosage of YEZTUGO (see Table 2 ) .

Maintain Scheduled Continuation Injection Dosing

Schedule for Supplemental Doses of YEZTUGO Time Dosage Continue to administer once every 6-months scheduled continuation dosing of YEZTUGO 927 mg subcutaneously (2 x 1.5 mL injections) (see Table 1 ), plus administer supplemental doses of YEZTUGO as shown in this table On day moderate CYP3A inducer is initiated Supplemental dosage 463.5 mg subcutaneously (1 x 1.5 mL injection) If moderate CYP3A inducer is co-administered for longer than 6 months Subsequent supplemental dosage Every 6-months 26 weeks +/-2 weeks. from initiation of moderate CYP3A inducer, continue to administer a supplemental dose of YEZTUGO as described above. After stopping the moderate CYP3A inducer, continue the once every 6-months scheduled continuation injection dosing of YEZTUGO (see Table 1 ) .

2.6 Preparation and Administration of Subcutaneous Injection YEZTUGO injection is only for subcutaneous administration into the abdomen by a healthcare provider. The thigh can be used as an alternative injection site if preferred. Do NOT administer intradermally due to risk of serious injection site reactions <span class="opacity-50 text-xs">[see Warnings and Precautions (5.4) ]</span>. Use aseptic technique. Visually inspect the solution in the vials and prepared syringe for particulate matter and discoloration prior to administration. YEZTUGO injection is a yellow solution. Do not use YEZTUGO injection if the solution is discolored or if it contains particulate matter. Once the solution is withdrawn from the vials, the subcutaneous injections should be administered as soon as possible <span class="opacity-50 text-xs">[see How Supplied/Storage and Handling (16) ]</span>.

Figure

1 identifies the components for use in the administration steps for the withdrawal needle injection kit, and the administration steps are provided in Figure 2 .

The

18-gauge needle is for withdrawal only in this kit. The injection kit components are for single use only.

Two

1.5 mL injections are required for a complete dose.

Figure

1 YEZTUGO Withdrawal Needle Injection Kit Components Figure 2 YEZTUGO Injection Steps for Withdrawal Needle Injection Kit Figure 1 Figure 2

Concomitant administration of SUNLENCA with strong CYP3A inducers is contraindicated due to decreased lenacapavir plasma concentrations, which may result in the loss of therapeutic effect and development of resistance to SUNLENCA [see Drug Interactions (7.1) ] . Concomitant administration of SUNLENCA is contraindicated with strong CYP3A inducers. ( 4 )

REACTIONS The following adverse reactions are discussed in other sections of the labeling: Serious Injection Site Reactions with Improper Administration [see Warnings and Precautions (5.4) ]. Most common adverse reactions (incidence greater than or equal to 5%, all grades) are injection site reactions, headache, and nausea. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Gilead Sciences, Inc. at 1-800-GILEAD-5 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .

6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The primary safety assessment of YEZTUGO is based on data from two randomized, double-blind, active-controlled trials, PURPOSE 1 and PURPOSE 2, in which a total of 8616 adult and adolescent participants received YEZTUGO (N=4323), DESCOVY (emtricitabine [FTC]/tenofovir alafenamide [TAF]; N=2135) once daily, or TRUVADA (FTC/tenofovir disoproxil fumarate [TDF]; N=2158) once daily for HIV-1 PrEP. In PURPOSE 1, the median duration of exposure to YEZTUGO, DESCOVY, and TRUVADA was 43, 42, and 41 weeks, respectively. In PURPOSE 2, the median duration of exposure to both YEZTUGO and TRUVADA was 39 weeks. The most common adverse reactions (all Grades) reported in at least 5% of participants receiving YEZTUGO in either PURPOSE 1 or PURPOSE 2 were injection site reactions, headache, and nausea. In PURPOSE 1, &lt;1% of participants in the groups receiving YEZTUGO, DESCOVY or TRUVADA, discontinued due to adverse events (all causality). In PURPOSE 2, 1% of participants in the group receiving YEZTUGO and &lt;1% of participants receiving TRUVADA discontinued due to adverse events (all causality).

Table

6 presents the frequency of adverse reactions (all Grades) in at least 2% of participants receiving YEZTUGO in either PURPOSE 1 or PURPOSE 2.

Table

6.

Adverse Drug

Reactions (All Grades) Reported in ≥2% Frequencies of adverse reactions are based on all adverse events attributed to study drug (or to the procedure for injection site reactions) by the investigator. of Participants Receiving YEZTUGO in PURPOSE 1 or PURPOSE 2 PURPOSE 1 PURPOSE 2 Adverse Reaction YEZTUGO N=2140 TRUVADA Participants received placebo subcutaneous injections (polyethylene glycol 400). N=1070 YEZTUGO N=2183 TRUVADA N=1088 Injection Site Reactions 69% 34% 83% 69% Headache 7% 8% 2% 2% Nausea 5% 11% 2% 4% Dizziness 4% 6% <1% 1% Vomiting 4% 7% <1% 1% Diarrhea 4% 4% 2% 2% Injection-Associated Adverse Reactions Local Injection Site Reactions (ISRs) The most frequent adverse reactions associated with lenacapavir injection for subcutaneous use in PURPOSE 1 and PURPOSE 2 were ISRs. The most commonly reported ISRs (all grades) in at least 2% of participants who received YEZTUGO in either PURPOSE 1 or PURPOSE 2 are presented in Table 7 . PURPOSE 1 In PURPOSE 1, 69% of participants receiving YEZTUGO experienced ISRs, compared to 35% of participants receiving placebo injections (and DESCOVY or TRUVADA). Most participants who received YEZTUGO had mild (Grade 1, 50%) or moderate (Grade 2, 19%) severity ISRs.

Grade

3 ISRs were reported in 4 (0.2%) participants, and included ulcer and nodule. YEZTUGO was discontinued due to ISRs in 4 (0.2%) participants. None of the ISRs were serious. The incidence of reported ISRs decreased with subsequent injections. Nodules: Injection site nodule was reported in 64% of participants who received YEZTUGO and resolved more slowly than other ISRs. The median duration of nodules associated with the first injections of YEZTUGO was 350 (interquartile range: 182, 470) days. The median of the maximum observed nodule diameter from each participant was 3.0 (interquartile range: 2.0, 3.5) cm. Other ISRs: The other ISRs reported in more than 2% of participants who received YEZTUGO were pain (31%), swelling (4%), induration (4%), and pruritus (2%). The median duration of induration, which resolved more slowly than most other ISRs, was 173 (interquartile range: 22, 267) days. The median duration of ISRs, excluding nodules and indurations, was 9 (interquartile range: 4 to 30) days. PURPOSE 2 In PURPOSE 2, 83% of participants receiving YEZTUGO experienced ISRs, compared to 69% of participants receiving placebo injections (and TRUVADA). Most participants had mild (Grade 1, 66%) or moderate (Grade 2, 17%) severity ISRs.

Grade

3 ISRs were reported in 14 (0.6%) participants, and included ulcer, pain, erythema, edema, and dermatitis. YEZTUGO was discontinued due to ISRs in 26 (1.2%) participants. None of the ISRs were serious. The incidence of reported ISRs decreased with subsequent injections. Nodules: Injection site nodule was reported in 63% of participants who received YEZTUGO and resolved more slowly than other ISRs. The median duration of nodules associated with the first injections of YEZTUGO was 297 (interquartile range: 176, 423) days. The median of the maximum observed nodule diameter for each participant was 3.0 (interquartile range: 2.0, 4.0) cm. Other ISRs: The other ISRs reported in more than 2% of participants who received YEZTUGO were pain (56%), erythema (17%), induration (16%), swelling (7%), bruising (3%), pruritus (3%), and warmth (2%). The median duration of induration, which resolved more slowly than most other ISRs, was 151 (interquartile range: 15, 267) days. The median duration of ISRs, excluding nodules and indurations, was 4 (interquartile range: 2 to 8) days.

Table

7.

Injection Site

Reactions (All Grades) Reported in ≥2% Frequencies are based on all injection site reactions attributed to study drug (or to the procedure) by the investigator. of Participants Receiving YEZTUGO in PURPOSE 1 or PURPOSE 2 PURPOSE 1 PURPOSE 2 Injection Site Reactions YEZTUGO N=2140 DESCOVY or TRUVADA Participants received placebo subcutaneous injections (polyethylene glycol 400). N=3205 YEZTUGO N=2183 TRUVADA N=1088 Nodule 64% 17% 63% 39% Pain 31% 24% 56% 53% Induration 4% <1% 16% 10% Swelling 4% 5% 7% 10% Pruritus 2% 1% 3% 3% Erythema 1% 1% 17% 19% Bruising <1% <1% 3% 4% Warmth <1% <1% 2% 2% Nodules and Indurations Dermatopathology In a separate clinical trial (CAPELLA) in participants with HIV-1 who received lenacapavir via subcutaneous injection, skin biopsies of injection site nodules or indurations revealed dermatopathological findings of foreign body inflammation or granulomatous response in some participants.

AND PRECAUTIONS Comprehensive management to reduce the risk of HIV-1 acquisition. ( 5.1 ) Potential risk of developing resistance to lenacapavir if an individual acquires HIV-1 either before or when receiving YEZTUGO, or following discontinuation of YEZTUGO. Test before each injection and additionally as clinically appropriate to confirm HIV-1 negative status ( 5.2 ) Residual concentrations of lenacapavir may remain in systemic circulation for up to 12 months or longer. ( 5.3 ) Improper administration (intradermal injection) has been associated with serious injection site reactions. ( 5.4 )

5.1 Comprehensive Management to Reduce the Risk of HIV-1 Infection and Other Sexually Acquired Infections Use YEZTUGO to reduce the risk of HIV-1 acquisition as part of a comprehensive prevention strategy including adherence to the administration schedule and safer sex practices, including condoms, to reduce the risk of sexually transmitted infections (STIs). YEZTUGO is not always effective in preventing HIV-1 acquisition <span class="opacity-50 text-xs">[see Clinical Studies (14) ]</span>. The time from initiation of YEZTUGO for HIV-1 PrEP to maximal protection against HIV-1 infection is unknown. Risk for HIV-1 acquisition includes behavioral, biological, or epidemiologic factors including, but not limited to, condomless sex, past or current STIs, self-identified HIV risk, having sexual partners of unknown HIV-1 viremic status, or sexual activity in a high prevalence area or network. Counsel individuals on the use of other prevention measures (e.g., consistent and correct condom use; knowledge of partner(s)’ HIV-1 status, including viral suppression status; regular testing for STIs that can facilitate HIV-1 transmission). Inform individuals about and support their efforts in reducing sexual behaviors associated with HIV-1 acquisition risk. Use YEZTUGO to reduce the risk of HIV-1 acquisition only in individuals confirmed to be HIV-1 negative <span class="opacity-50 text-xs">[see Contraindications (4) ]</span> . Evaluate for current or recent signs or symptoms consistent with acute HIV-1 infection (e.g., fever, fatigue, myalgia, skin rash). Confirm HIV-1 negative status prior to initiating YEZTUGO, prior to each subsequent injection of YEZTUGO, and additionally as clinically appropriate (e.g., upon diagnosis of other sexually transmitted infections or if clinical symptoms consistent with acute HIV-1 infection are present) using a test approved or cleared by the FDA for the diagnosis of acute or primary HIV-1 infection <span class="opacity-50 text-xs">[see Dosage and Administration (2.1) ]</span> . Counsel and support individuals on adhering to the YEZTUGO administration schedule, on the use of other measures to reduce the risk of STIs, and on the importance of routine testing for HIV-1 and other STIs. Some individuals, such as adolescents, may benefit from additional counseling and appointment reminders to support adherence to the dosing and testing schedule <span class="opacity-50 text-xs">[see Use in Specific Populations (8.4) ]</span> .

5.2 Potential Risk of Resistance with YEZTUGO There is a potential risk of developing resistance to YEZTUGO if an individual acquires HIV-1 either before or when receiving YEZTUGO, or following discontinuation of YEZTUGO. HIV-1 resistance substitutions may emerge in individuals with undiagnosed HIV-1 infection who are taking only YEZTUGO, because YEZTUGO alone does not constitute a complete regimen for HIV-1 treatment <span class="opacity-50 text-xs">[see Microbiology (12.4) ]</span> . To minimize this risk, it is essential to test before each injection and additionally as clinically appropriate (e.g., upon diagnosis of other sexually transmitted infections or if clinical symptoms consistent with acute HIV-1 infection are present) to confirm HIV-1 negative status using a test approved or cleared by the FDA for the diagnosis of acute or primary HIV-1 infection. Individuals who are confirmed to have HIV-1 must immediately begin a complete HIV-1 treatment regimen to reduce the risk of developing resistance. In addition, due to the long-acting properties of YEZTUGO, alternative forms of PrEP should be considered following discontinuation of YEZTUGO for those individuals with HIV-1 negative status who are at continuing risk of HIV-1 acquisition and initiated within 28 weeks of the last YEZTUGO injection <span class="opacity-50 text-xs">[see Warnings and Precautions (5.3) ]</span>.

5.3 Long-Acting Properties and Potential Associated Risks with YEZTUGO Healthcare providers should take the long-acting properties of YEZTUGO into consideration when YEZTUGO is prescribed. Residual concentrations of lenacapavir may remain in the systemic circulation of individuals for prolonged periods (up to 12 months or longer after the last subcutaneous dose). It is important to select individuals who agree to the required injection dosing schedule because non-adherence to every-6-monthly injections or missed doses could lead to HIV-1 acquisition and development of resistance. Lenacapavir, a moderate CYP3A inhibitor, may increase the exposure to, and therefore potential risk of adverse reactions from, drugs primarily metabolized by CYP3A initiated within 9 months after the last subcutaneous dose of YEZTUGO <span class="opacity-50 text-xs">[see Drug Interactions (7.2) and Clinical Pharmacology (12.3) ]</span> .

5.4 Serious Injection Site Reactions with Improper Administration Improper administration (intradermal injection) of lenacapavir has been associated with serious injection site reactions, including necrosis and ulcer. Ensure YEZTUGO is only administered subcutaneously <span class="opacity-50 text-xs">[see Dosage and Administration (2.6) ]</span> .

INTERACTIONS Consult the Full Prescribing Information prior to and during treatment for important drug interactions. ( 4 , 7 , 12.3 )

7.1 Effect of Other Drugs on SUNLENCA Lenacapavir is a substrate of P-gp, UGT1A1, and CYP3A. Strong or Moderate CYP3A Inducers Drugs that are strong or moderate inducers of CYP3A may significantly decrease plasma concentrations of lenacapavir <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span> , which may result in loss of therapeutic effect of SUNLENCA and development of resistance. Concomitant administration of SUNLENCA with strong CYP3A inducers during SUNLENCA treatment is contraindicated <span class="opacity-50 text-xs">[see Contraindications (4) ]</span> . Concomitant administration of SUNLENCA with moderate CYP3A inducers during SUNLENCA treatment is not recommended. Combined P-gp, UGT1A1, and Strong CYP3A Inhibitors Combined P-gp, UGT1A1, and strong CYP3A inhibitors may significantly increase plasma concentrations of SUNLENCA. Concomitant administration of SUNLENCA with these inhibitors is not recommended.

7.2 Effect of SUNLENCA on Other Drugs Lenacapavir is a moderate inhibitor of CYP3A. Due to the long half-life of lenacapavir following subcutaneous administration, SUNLENCA may increase the exposure of drugs primarily metabolized by CYP3A <span class="opacity-50 text-xs">[see Clinical Pharmacology (12.3) ]</span> initiated within 9 months after the last subcutaneous dose of SUNLENCA, which may increase the potential risk of adverse reactions. See the prescribing information of the sensitive CYP3A substrate for dosing recommendations with moderate inhibitors of CYP3A.

7.3 Established and Other Potentially Significant Drug Interactions Table 5 provides a listing of clinically significant drug interactions with recommended prevention or management strategies, but is not all inclusive. The drug interactions described are based on studies conducted with SUNLENCA or are drug interactions that may occur with SUNLENCA <span class="opacity-50 text-xs">[see Contraindications (4) and Clinical Pharmacology (12.3) ]</span> .

Table

5 Drug Interactions with SUNLENCA Concomitant Drug Class: Drug Name Effect on Concentration ↑ = Increase, ↓ = Decrease.

Clinical Comment

Antiarrhythmics: digoxin ↑ digoxin Use with caution and monitor digoxin therapeutic concentration. Anticoagulants: Direct Oral Anticoagulants (DOACs) rivaroxaban dabigatran edoxaban ↑ DOAC Refer to the DOAC prescribing information for concomitant administration with moderate CYP3A inhibitors and/or P-gp inhibitors. Anticonvulsants: carbamazepine oxcarbazepine phenobarbital phenytoin ↓ lenacapavir Concomitant administration of carbamazepine, oxcarbazepine, phenobarbital, or phenytoin may result in loss of therapeutic effect and development of resistance. Concomitant administration of SUNLENCA with carbamazepine or phenytoin is contraindicated. Concomitant administration of SUNLENCA with oxcarbazepine or phenobarbital is not recommended. Consider use of alternative anticonvulsants.

Antiretroviral

Agents: atazanavir/cobicistat Drug-drug interaction study was conducted. atazanavir/ritonavir ↑ lenacapavir (atazanavir/cobicistat, atazanavir/ritonavir) Concomitant administration of efavirenz, nevirapine, or tipranavir/ritonavir may result in loss of therapeutic effect and development of resistance. efavirenz nevirapine tipranavir/ritonavir ↓ lenacapavir (efavirenz, nevirapine, tipranavir/ritonavir) Concomitant administration with atazanavir/cobicistat, atazanavir/ritonavir, efavirenz, nevirapine, or tipranavir/ritonavir is not recommended. Antimycobacterials: rifabutin rifampin rifapentine ↓ lenacapavir Concomitant administration of rifabutin, rifampin and rifapentine may result in loss of therapeutic effect and development of resistance. Concomitant administration of SUNLENCA with rifampin is contraindicated [see Contraindications (4) ] . Concomitant administration of SUNLENCA with rifabutin or rifapentine is not recommended. Corticosteroids (systemic): cortisone/hydrocortisone dexamethasone ↑ corticosteroids (systemic) Concomitant administration with systemic corticosteroids whose exposures are significantly increased by CYP3A inhibitors can increase the risk for Cushing's syndrome and adrenal suppression. Initiate with the lowest starting dose and titrate carefully while monitoring for safety. ↓ lenacapavir (dexamethasone) Concomitant administration of systemic dexamethasone may result in loss of therapeutic effect of lenacapavir and development of resistance. Alternative corticosteroids to dexamethasone should be considered, particularly for long-term use. Ergot derivatives: dihydroergotamine ergotamine methylergonovine ↑ dihydroergotamine ↑ ergotamine ↑ methylergonovine Concomitant administration of SUNLENCA with dihydroergotamine, ergotamine or methylergonovine is not recommended.

Herbal

Products: St. John's wort The induction potency of St. John's wort may vary widely based on preparation. (Hypericum perforatum) ↓ lenacapavir Concomitant administration of St. John's wort may result in loss of therapeutic effect and development of resistance. Concomitant administration of SUNLENCA with St. John's wort is contraindicated. HMG-CoA Reductase Inhibitors: lovastatin simvastatin ↑ lovastatin ↑ simvastatin Initiate lovastatin and simvastatin with the lowest starting dose and titrate carefully while monitoring for safety (e.g., myopathy). Narcotic analgesics metabolized by CYP3A: e.g., fentanyl, oxycodone ↑ fentanyl ↑ oxycodone Careful monitoring of therapeutic effects and adverse reactions associated with CYP3A-metabolized narcotic analgesics (including potentially fatal respiratory depression) is recommended with co-administration. tramadol ↑ tramadol A decrease in dose may be needed for tramadol with concomitant use. Narcotic analgesic for treatment of opioid dependence: buprenorphine, methadone buprenorphine: effects unknown methadone: effects unknown Initiation of buprenorphine or methadone in patients taking SUNLENCA: Carefully titrate the dose of buprenorphine or methadone to the desired effect; use the lowest feasible initial or maintenance dose. Initiation of SUNLENCA in patients taking buprenorphine or methadone: A dose adjustment for buprenorphine or methadone may be needed. Monitor clinical signs and symptoms.

Opioid

Antagonist: naloxegol ↑ naloxegol Avoid use with SUNLENCA; if unavoidable, decrease the dosage of naloxegol and monitor for adverse reactions. Phosphodiesterase-5 (PDE-5) Inhibitors: sildenafil tadalafil vardenafil ↑ PDE-5 inhibitors Use of PDE-5 inhibitors for pulmonary arterial hypertension (PAH): Concomitant administration of SUNLENCA with tadalafil for the treatment of PAH is not recommended. Use of PDE-5 inhibitors for erectile dysfunction (ED): Refer to the prescribing information of PDE-5 inhibitors for dose recommendations. Sedatives/Hypnotics: midazolam (oral) triazolam ↑ midazolam (oral) ↑ triazolam Use with caution when midazolam or triazolam is concomitantly administered with SUNLENCA

7.4 Drugs without Clinically Significant Interactions with SUNLENCA Based on drug interaction studies conducted with SUNLENCA, no clinically significant drug interactions have been observed with: darunavir/cobicistat, cobicistat, famotidine, pitavastatin, rosuvastatin, tenofovir alafenamide, and voriconazole.