Skip to content
Important: This site presents data from the FDA Adverse Event Reporting System (FAERS). A report does not mean the drug caused the event. Full disclaimer.

THIOTEPA Drug Interactions: What You Need to Know

Boost Your Natural Energy & Metabolism

Mitolyn — 6 exotic plants to unlock your body's fat-burning power. 90-day guarantee.

Try Mitolyn Now

Drug Interactions (FDA Label)

INTERACTIONS

7.1 Effect of Cytochrome CYP3A Inhibitors and Inducers In vitro studies suggest that thiotepa is metabolized by CYP3A4 and CYP2B6 to its active metabolite TEPA. Avoid co-administration of strong CYP3A4 inhibitors (e.g., itraconazole, clarithromycin, ritonavir) and strong CYP3A4 inducers (e.g., rifampin, phenytoin) with TEPADINA due to the potential effects on efficacy and toxicity <span class="opacity-50 text-xs">[see Clinical Pharmacology ( 12.3 ) ]</span> . Consider alternative medications with no or minimal potential to inhibit or induce CYP3A4. If concomitant use of strong CYP3A4 modulators cannot be avoided, closely monitor for adverse drug reactions.

7.2 Effect of TEPADINA on Cytochrome CYP2B6 Substrates In vitro studies suggest that thiotepa inhibits CYP2B6. TEPADINA may increase the exposure of drugs that are substrates of CYP2B6 in patients; however, the clinical relevance of this in vitro interaction is unknown <span class="opacity-50 text-xs">[see Clinical Pharmacology ( 12.3 ) ]</span> . The administration of thiotepa with cyclophosphamide in patients reduces the conversion of cyclophosphamide to the active metabolite, 4-hydroxycyclophosphamide; the effect appears sequence dependent with a greater reduction in the conversion to 4-hydroxycyclophosphamide when thiotepa is administered 1.5 hours prior to the intravenous administration of cyclophosphamide compared to administration of thiotepa after intravenous cyclophosphamide <span class="opacity-50 text-xs">[see Clinical Pharmacology ( 12.3 ) ]</span> . The reduction in 4-hydroxycyclophosphamide levels may potentially reduce efficacy of cyclophosphamide treatment.

7.1 Effect of Cytochrome CYP3A Inhibitors and Inducers In vitro studies suggest that thiotepa is metabolized by CYP3A4 and CYP2B6 to its active metabolite TEPA. Avoid co-administration of strong CYP3A4 inhibitors (e.g., itraconazole, clarithromycin, ritonavir) and strong CYP3A4 inducers (e.g., rifampin, phenytoin) with TEPADINA due to the potential effects on efficacy and toxicity <span class="opacity-50 text-xs">[see Clinical Pharmacology ( 12.3 ) ]</span> . Consider alternative medications with no or minimal potential to inhibit or induce CYP3A4. If concomitant use of strong CYP3A4 modulators cannot be avoided, closely monitor for adverse drug reactions.

7.2 Effect of TEPADINA on Cytochrome CYP2B6 Substrates In vitro studies suggest that thiotepa inhibits CYP2B6. TEPADINA may increase the exposure of drugs that are substrates of CYP2B6 in patients; however, the clinical relevance of this in vitro interaction is unknown <span class="opacity-50 text-xs">[see Clinical Pharmacology ( 12.3 ) ]</span> . The administration of thiotepa with cyclophosphamide in patients reduces the conversion of cyclophosphamide to the active metabolite, 4-hydroxycyclophosphamide; the effect appears sequence dependent with a greater reduction in the conversion to 4-hydroxycyclophosphamide when thiotepa is administered 1.5 hours prior to the intravenous administration of cyclophosphamide compared to administration of thiotepa after intravenous cyclophosphamide <span class="opacity-50 text-xs">[see Clinical Pharmacology ( 12.3 ) ]</span> . The reduction in 4-hydroxycyclophosphamide levels may potentially reduce efficacy of cyclophosphamide treatment.

Contraindications

CONTRAINDICATIONS Thiotepa is contraindicated in patients with a known hypersensitivity (allergy) to this preparation. Therapy is probably contraindicated in cases of existing hepatic, renal, or bone-marrow damage. However, if the need outweighs the risk in such patients, thiotepa may be used in low dosage, and accompanied by hepatic, renal and hemopoietic function tests.

Related Warnings

AND PRECAUTIONS Cutaneous toxicity: Cleanse skin at least twice daily through 48 hours after the last dose of thiotepa for injection. ( 5.3) Embryo-Fetal toxicity: Can cause fetal harm. Advise females of reproductive potential of the potential risk to a fetus and to avoid pregnancy. ( 5.8 )

5.1 Myelosuppression The consequence of treatment with high doses of thiotepa for injection together with other chemotherapy is profound myelosuppression occurring in all patients. Monitor complete blood counts, and provide supportive care for infections, anemia and thrombocytopenia until there is adequate hematopoietic recovery. For patients receiving thiotepa for injection for treatment of adenocarcinoma of the breast, adenocarcinoma of the ovary, malignant effusions and superficial papillary carcinoma of the urinary bladder, if the bone marrow has been compromised by prior irradiation or chemotherapy, or is recovering from chemotherapy, the risk of severe myelosuppression with thiotepa for injection may be increased. Perform periodic complete blood counts during the course of treatment with thiotepa for injection. Provide supportive care for infections, bleeding, and symptomatic anemia <span class="opacity-50 text-xs">[see Adverse Reactions (6.1 )]</span> . Pediatric use information is approved for Adienne SA’s TEPADINA (thiotepa) for Injection. However, due to Adienne SA’s marketing exclusivity rights, the drug product is not labeled with that information.

5.2 Hypersensitivity Clinically significant hypersensitivity reactions, including anaphylaxis, have occurred following administration of thiotepa for injection. If anaphylactic or other clinically significant allergic reaction occurs, discontinue treatment with thiotepa for injection, initiate appropriate therapy, and monitor until signs and symptoms resolve <span class="opacity-50 text-xs">[see Contraindications (4) , Adverse Reactions (6.1 )]</span> .

5.3 Cutaneous Toxicity Thiotepa for injection and/or its active metabolites may be excreted in part via skin patients receiving high-dose therapy. Treatment with thiotepa for injection may cause skin discoloration, pruritus, blistering, desquamation, and peeling that may be more severe in the groin, axillae, skin folds, in the neck area, and under dressings. Instruct patients to shower or bathe with water at least twice daily through 48 hours after administration of thiotepa for injection. Change occlusive dressing and clean the covered skin at least twice daily through 48 hours after administration of thiotepa for injection. Change bed sheets daily during treatment. Skin reactions associated with accidental exposure to thiotepa for injection may also occur. Wash the skin thoroughly with soap and water in case thiotepa solution contacts the skin. Flush mucous membranes in case of thiotepa for injection contact with mucous membranes.

5.4 Concomitant Use of Live and Attenuated Vaccines Do not administer live or attenuated viral or bacterial vaccines to a patient treated with thiotepa for injection until the immunosuppressive effects have resolved.

5.5 Hepatic Veno-Occlusive Disease Hepatic veno-occlusive disease may occur in patients who have received high-dose thiotepa for injection in conjunction with busulfan and cyclophosphamide. Monitor by physical examination, serum transaminases and bilirubin, and provide supportive care to patients who develop hepatic veno-occlusive disease. Pediatric use information is approved for Adienne SA’s TEPADINA (thiotepa) for Injection. However, due to Adienne SA’s marketing exclusivity rights, the drug product is not labeled with that information.

5.6 Central Nervous System Toxicity Fatal encephalopathy has occurred in patients treated with high doses of thiotepa. Other central nervous system toxicities, such as headache, apathy, psychomotor retardation, disorientation, confusion, amnesia, hallucinations, drowsiness, somnolence, seizures, coma, inappropriate behavior and forgetfulness have been reported to occur in a dose-dependent manner during or shortly after administration of high-dose thiotepa. Do not exceed the recommended dose of thiotepa. If severe or life-threatening central nervous system toxicity occurs, discontinue administration of thiotepa for injection and provide supportive care. Pediatric use information is approved for Adienne SA’s TEPADINA (thiotepa) for Injection. However, due to Adienne SA’s marketing exclusivity rights, the drug product is not labeled with that information.

5.7 Carcinogenicity Like many alkylating agents, thiotepa has been reported to be carcinogenic when administered to laboratory animals <span class="opacity-50 text-xs">[see Nonclinical Toxicity (13.1) ]</span> . Carcinogenicity is shown most clearly in studies using mice, but there is some evidence of carcinogenicity in man. There is an increased risk of a secondary malignancy with use of thiotepa for injection.

5.8 Embryo-Fetal Toxicity Based on the mechanism of action and findings in animals, thiotepa for injection can cause fetal harm when administered to a pregnant woman. There are no adequate and well-controlled studies of thiotepa for injection in pregnant women. Thiotepa given by the intraperitoneal (IP) route was teratogenic in mice at doses ≥ 1 mg/kg (3.2 mg/m 2 ), approximately 8-fold less than the maximum recommended human therapeutic dose (0.8 mg/kg, 27 mg/m 2 ), based on body-surface area. Thiotepa given by the IP route was teratogenic in rats at doses ≥ 3 mg/kg (21 mg/m 2 ), approximately equal to the maximum recommended human therapeutic dose, based on body-surface area. Thiotepa was lethal to rabbit fetuses at a dose of 3 mg/kg (41 mg/m 2 ), approximately two times the maximum recommended human therapeutic dose based on body-surface area. Advise pregnant women of the potential risk to the fetus [ see Use in Specific Populations ( 8.1 , 8.3 ) ]. Advise females of reproductive potential to use highly effective contraception during and after treatment with thiotepa for injection for at least 6 months after therapy. Advise males of reproductive potential to use effective contraception during and after treatment with thiotepa for injection for at least 1 year after therapy [ see Use in Specific Populations ( 8.1 , 8.3 ) ].

5.1 Myelosuppression The consequence of treatment with high doses of thiotepa for injection together with other chemotherapy is profound myelosuppression occurring in all patients. Monitor complete blood counts, and provide supportive care for infections, anemia and thrombocytopenia until there is adequate hematopoietic recovery. For patients receiving thiotepa for injection for treatment of adenocarcinoma of the breast, adenocarcinoma of the ovary, malignant effusions and superficial papillary carcinoma of the urinary bladder, if the bone marrow has been compromised by prior irradiation or chemotherapy, or is recovering from chemotherapy, the risk of severe myelosuppression with thiotepa for injection may be increased. Perform periodic complete blood counts during the course of treatment with thiotepa for injection. Provide supportive care for infections, bleeding, and symptomatic anemia <span class="opacity-50 text-xs">[see Adverse Reactions (6.1 )]</span> . Pediatric use information is approved for Adienne SA’s TEPADINA (thiotepa) for Injection. However, due to Adienne SA’s marketing exclusivity rights, the drug product is not labeled with that information.

5.2 Hypersensitivity Clinically significant hypersensitivity reactions, including anaphylaxis, have occurred following administration of thiotepa for injection. If anaphylactic or other clinically significant allergic reaction occurs, discontinue treatment with thiotepa for injection, initiate appropriate therapy, and monitor until signs and symptoms resolve <span class="opacity-50 text-xs">[see Contraindications (4) , Adverse Reactions (6.1 )]</span> .

5.3 Cutaneous Toxicity Thiotepa for injection and/or its active metabolites may be excreted in part via skin patients receiving high-dose therapy. Treatment with thiotepa for injection may cause skin discoloration, pruritus, blistering, desquamation, and peeling that may be more severe in the groin, axillae, skin folds, in the neck area, and under dressings. Instruct patients to shower or bathe with water at least twice daily through 48 hours after administration of thiotepa for injection. Change occlusive dressing and clean the covered skin at least twice daily through 48 hours after administration of thiotepa for injection. Change bed sheets daily during treatment. Skin reactions associated with accidental exposure to thiotepa for injection may also occur. Wash the skin thoroughly with soap and water in case thiotepa solution contacts the skin. Flush mucous membranes in case of thiotepa for injection contact with mucous membranes.

5.4 Concomitant Use of Live and Attenuated Vaccines Do not administer live or attenuated viral or bacterial vaccines to a patient treated with thiotepa for injection until the immunosuppressive effects have resolved.

5.6 Central Nervous System Toxicity Fatal encephalopathy has occurred in patients treated with high doses of thiotepa. Other central nervous system toxicities, such as headache, apathy, psychomotor retardation, disorientation, confusion, amnesia, hallucinations, drowsiness, somnolence, seizures, coma, inappropriate behavior and forgetfulness have been reported to occur in a dose-dependent manner during or shortly after administration of high-dose thiotepa. Do not exceed the recommended dose of thiotepa. If severe or life-threatening central nervous system toxicity occurs, discontinue administration of thiotepa for injection and provide supportive care. Pediatric use information is approved for Adienne SA’s TEPADINA (thiotepa) for Injection. However, due to Adienne SA’s marketing exclusivity rights, the drug product is not labeled with that information.

5.7 Carcinogenicity Like many alkylating agents, thiotepa has been reported to be carcinogenic when administered to laboratory animals <span class="opacity-50 text-xs">[see Nonclinical Toxicity (13.1) ]</span> . Carcinogenicity is shown most clearly in studies using mice, but there is some evidence of carcinogenicity in man. There is an increased risk of a secondary malignancy with use of thiotepa for injection.

5.8 Embryo-Fetal Toxicity Based on the mechanism of action and findings in animals, thiotepa for injection can cause fetal harm when administered to a pregnant woman. There are no adequate and well-controlled studies of thiotepa for injection in pregnant women. Thiotepa given by the intraperitoneal (IP) route was teratogenic in mice at doses ≥ 1 mg/kg (3.2 mg/m 2 ), approximately 8-fold less than the maximum recommended human therapeutic dose (0.8 mg/kg, 27 mg/m 2 ), based on body-surface area. Thiotepa given by the IP route was teratogenic in rats at doses ≥ 3 mg/kg (21 mg/m 2 ), approximately equal to the maximum recommended human therapeutic dose, based on body-surface area. Thiotepa was lethal to rabbit fetuses at a dose of 3 mg/kg (41 mg/m 2 ), approximately two times the maximum recommended human therapeutic dose based on body-surface area. Advise pregnant women of the potential risk to the fetus [ see Use in Specific Populations ( 8.1 , 8.3 ) ]. Advise females of reproductive potential to use highly effective contraception during and after treatment with thiotepa for injection for at least 6 months after therapy. Advise males of reproductive potential to use effective contraception during and after treatment with thiotepa for injection for at least 1 year after therapy [ see Use in Specific Populations ( 8.1 , 8.3 ) ].

More About THIOTEPA

THIOTEPA Full Profile Patient Demographics Reports by Year