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Clozapine

Also known as: Versacloz, Clozaril

Atypical Antipsychotic

Route: Oral

Check Clozapine Interactions →
46 interactions on record⛔ Black Box Warning

Clozapine has 46 known drug interactions based on U.S. FDA drug labeling data. Of these, 5 are contraindicated combinations that should be avoided entirely. 5 are classified as major interactions requiring close medical supervision. Notable interactions include combinations with Carbamazepine, Lorazepam, Phenytoin. Patients taking Clozapine should inform their healthcare provider of all current medications — including over-the-counter drugs and supplements — to avoid potentially harmful combinations. Data sourced from OpenFDA and the NIH National Library of Medicine.

Total
46
Contraindicated
5
Major
5
Moderate
32

Contraindicated (5)

  • Clozapine + Carbamazepine— Strong CYP3A4 inducer that decreases clozapine plasma concentration. Concomitant use is not recommended due to decreased…
  • Clozapine + Lorazepam— Concomitant use may produce marked sedation, excessive salivation, hypotension, ataxia, delirium, and respiratory arrest…
  • Clozapine + Phenytoin— Strong CYP3A4 inducer that decreases clozapine plasma concentration. Concomitant use is not recommended due to decreased…
  • Clozapine + Rifampin— Strong CYP3A4 inducer that decreases clozapine plasma concentration. Concomitant use is not recommended due to decreased…
  • Clozapine + St. John'S Wort— Strong CYP3A4 inducer that decreases clozapine plasma concentration. Concomitant use is not recommended due to decreased…

Major (5)

  • Clozapine + Ciprofloxacin— Strong CYP1A2 inhibitor that increases clozapine plasma levels, potentially resulting in adverse reactions. Requires dos…
  • Clozapine + Enoxacin— Strong CYP1A2 inhibitor that increases clozapine plasma levels, potentially resulting in adverse reactions. Requires dos…
  • Clozapine + Fluoxetine Hydrochloride— Potential for elevation of clozapine levels with risk of toxicity.
  • Clozapine + Fluvoxamine— Strong CYP1A2 inhibitor that increases clozapine plasma levels, potentially resulting in adverse reactions. Requires dos…
  • Clozapine + Insulin Glargine— May decrease blood glucose lowering effect of LANTUS. Dosage increases and increased glucose monitoring may be required.

Moderate (32)

  • Clozapine + Bupropion— CYP2D6 or CYP3A4 inhibitor that can increase clozapine levels and lead to adverse reactions. Close monitoring and dose r…
  • Clozapine + Caffeine— Moderate or weak CYP1A2 inhibitor that may increase clozapine levels. Monitor patients closely and consider dose reducti…
  • Clozapine + Cimetidine— CYP2D6 or CYP3A4 inhibitor that can increase clozapine levels and lead to adverse reactions. Close monitoring and dose r…
  • Clozapine + Duloxetine— CYP2D6 or CYP3A4 inhibitor that can increase clozapine levels and lead to adverse reactions. Close monitoring and dose r…
  • Clozapine + Erythromycin— CYP2D6 or CYP3A4 inhibitor that can increase clozapine levels and lead to adverse reactions. Close monitoring and dose r…
  • Clozapine + Escitalopram— CYP2D6 or CYP3A4 inhibitor that can increase clozapine levels and lead to adverse reactions. Close monitoring and dose r…
  • Clozapine + Fluoxetine— Potential for elevation of clozapine levels.
  • Clozapine + Glimepiride— Atypical antipsychotic that may reduce glucose-lowering effect of glimepiride, leading to worsening glycemic control.
  • Clozapine + Glipizide— May reduce glucose-lowering effect of glipizide, leading to worsening glycemic control; monitor closely.
  • Clozapine + Insulin Aspart Injection— Atypical antipsychotic that may decrease the blood glucose lowering effect. Dose adjustment and increased glucose monito…
  • Clozapine + Insulin Aspart-Szjj— May decrease blood glucose lowering effect. Dose adjustment and increased glucose monitoring may be required.
  • Clozapine + Insulin Degludec— Atypical antipsychotic that may decrease blood glucose lowering effect. Dosage increases and increased glucose monitorin…
  • Clozapine + Insulin Degludec And Liraglutide— Atypical antipsychotic that may decrease blood glucose-lowering effect; dosage increases and increased glucose monitorin…
  • Clozapine + Insulin Detemir— May decrease blood glucose lowering effect of insulin detemir. Dosage increases and increased glucose monitoring may be …
  • Clozapine + Insulin Glargine And Lixisenatide— Atypical antipsychotic that may decrease the blood glucose lowering effect. Dose increases and increased glucose monitor…
  • Clozapine + Insulin Glargine-Aglr— Atypical antipsychotic that may decrease blood glucose lowering effect. Dosage increases and increased glucose monitorin…
  • Clozapine + Insulin Glargine-Yfgn— Atypical antipsychotic that may decrease blood glucose lowering effect. Dosage increases and increased glucose monitorin…
  • Clozapine + Insulin Human— Atypical antipsychotic that may decrease blood glucose lowering effect; dose adjustment and increased glucose monitoring…
  • Clozapine + Insulin Icodec-Abae— May decrease blood glucose lowering effect of Awiqli. Dose increases and increased glucose monitoring may be required.
  • Clozapine + Insulin Lispro— Atypical antipsychotic that may decrease blood glucose lowering effect; dose adjustment and increased glucose monitoring…
  • Clozapine + Insulin Lispro-Aabc— Atypical antipsychotic that may decrease blood glucose lowering effect. Dose increases and increased glucose monitoring …
  • Clozapine + Olanzapine And Fuoxetine— May elevate clozapine levels.
  • Clozapine + Oral Contraceptives— Moderate or weak CYP1A2 inhibitor that may increase clozapine levels. Monitor patients closely and consider dose reducti…
  • Clozapine + Paroxetine— CYP2D6 or CYP3A4 inhibitor that can increase clozapine levels and lead to adverse reactions. Close monitoring and dose r…
  • Clozapine + Quinidine— CYP2D6 or CYP3A4 inhibitor that can increase clozapine levels and lead to adverse reactions. Close monitoring and dose r…
  • Clozapine + Repaglinide— Atypical antipsychotic that may decrease blood glucose lowering effect. Repaglinide dose increases and increased glucose…
  • Clozapine + Risperidone— Chronic administration of clozapine may decrease the clearance of risperidone.
  • Clozapine + Sertraline— CYP2D6 or CYP3A4 inhibitor that can increase clozapine levels and lead to adverse reactions. Close monitoring and dose r…
  • Clozapine + Terbinafine— CYP2D6 or CYP3A4 inhibitor that can increase clozapine levels and lead to adverse reactions. Close monitoring and dose r…
  • Clozapine + Tobacco Smoke— Moderate CYP1A2 inducer that can decrease clozapine plasma concentration. Consider increasing clozapine dose or monitori…
  • Clozapine + Vasopressin— Suspected of causing diabetes insipidus; may decrease pressor and antidiuretic effects of vasopressin. Hemodynamic monit…
  • Clozapine + Vasopressin In 0.9% Sodium Chloride— May cause diabetes insipidus, decreasing pressor and antidiuretic effects of vasopressin. Hemodynamic monitoring recomme…

Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine, supplemented with a small number of well-established interactions from curated clinical references. For informational purposes only. Always consult your pharmacist or physician.

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