increases toxicity of the other by serotonin levels. Modify Therapy/Monitor Closely. Concomitant use could result in life-threatening serotonin syndrome or opioid toxicity (eg, respiratory depression, coma). Buprenorphine long-acting injection is not recommended for patients taking MAOIs or within 14 days of stopping such treatment.captoprilphenelzine, captopril. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs lower blood pressure. Monitor blood pressure.carbinoxaminephenelzine increases effects of carbinoxamine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .cariprazinephenelzine, cariprazine. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).cetirizinephenelzine increases effects of cetirizine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .chlorpheniraminephenelzine increases effects of chlorpheniramine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .chlorpropamidephenelzine increases effects of chlorpropamide by unknown mechanism. Use Caution/Monitor.clemastinephenelzine increases effects of clemastine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .clozapinephenelzine, clozapine. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).desloratadinephenelzine increases effects of desloratadine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Potential for dangerous interaction. Use with caution and monitor closely.dexchlorpheniraminephenelzine increases effects of dexchlorpheniramine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .dextroamphetamine transdermalphenelzine, dextroamphetamine transdermal. Either increases effects of the other by serotonin levels. Modify Therapy/Monitor Closely. Initiate with lower doses and monitor for signs and symptoms of serotonin syndrome, particularly during initiation or dosage increase. If serotonin syndrome occurs, discontinue dextroamphetamine transdermal and concomitant serotonergic drug(s).diazepam intranasaldiazepam intranasal, phenelzine. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration may potentiate the CNS-depressant effects of each drug.dichlorphenamidedichlorphenamide, phenelzine. Either increases toxicity of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Both drugs can cause metabolic acidosis.difenoxin hcldifenoxin hcl, phenelzine. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of serotonin syndrome.diphenhydraminephenelzine increases effects of diphenhydramine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .diphenoxylate hcldiphenoxylate hcl, phenelzine. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of serotonin syndrome.donepezil transdermaldonepezil transdermal, phenelzine. Either decreases effects of the other by pharmacodynamic antagonism. Use Caution/Monitor.doxylaminephenelzine increases effects of doxylamine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .esketamine intranasalesketamine intranasal, phenelzine. Either increases toxicity of the other by sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. Closely monitor blood pressure with concomitant use of esketamine nasal with MAO-Is. .etomidatephenelzine increases levels of etomidate by pharmacodynamic synergism. Use Caution/Monitor.fexofenadinephenelzine increases effects of fexofenadine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .fluphenazinephenelzine, fluphenazine. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).gabapentingabapentin, phenelzine. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration of CNS depressants can result in serious, life-threatening, and fatal respiratory depression. Use lowest dose possible and monitor for respiratory depression and sedation.gabapentin enacarbilgabapentin enacarbil, phenelzine. Either increases effects of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Coadministration of CNS depressants can result in serious, life-threatening, and fatal respiratory depression. Use lowest dose possible and monitor for respiratory depression and sedation.ganaxolonephenelzine and ganaxolone both increase sedation. Use Caution/Monitor.glimepiridephenelzine increases effects of glimepiride by unknown mechanism. Use Caution/Monitor.glipizidephenelzine increases effects of glipizide by unknown mechanism. Use Caution/Monitor.glyburidephenelzine increases effects of glyburide by unknown mechanism. Use Caution/Monitor.green teagreen tea, phenelzine. Other (see comment). Use Caution/Monitor. Comment: Avoid combination or excessive consumption of green tea. Combination may increase risk of cardiac arrhythmias or severe hypertension can occur due to caffeine component of green tea.haloperidolphenelzine, haloperidol. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).hydralazinehydralazine, phenelzine. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of hypertension.hydroxyzinephenelzine increases effects of hydroxyzine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .iloperidonephenelzine, iloperidone. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).indacaterol, inhaledindacaterol, inhaled, phenelzine. QTc interval. Use Caution/Monitor. Indacaterol should be administered with extreme caution to patients treated with MAO inhibitors. Drugs that are known to prolong the QTc interval may have an increased the risk of ventricular arrhythmias.insulin aspartphenelzine increases effects of insulin aspart by unknown mechanism. Use Caution/Monitor.insulin degludecphenelzine, insulin degludec. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs decrease blood glucose.insulin degludec/insulin aspartphenelzine, insulin degludec/insulin aspart. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs decrease blood glucose.insulin detemirphenelzine increases effects of insulin detemir by unknown mechanism. Use Caution/Monitor.insulin glarginephenelzine increases effects of insulin glargine by unknown mechanism. Use Caution/Monitor.insulin glulisinephenelzine increases effects of insulin glulisine by unknown mechanism. Use Caution/Monitor.insulin inhaledphenelzine, insulin inhaled. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Both drugs decrease blood glucose.insulin lisprophenelzine increases effects of insulin lispro by unknown mechanism. Use Caution/Monitor.insulin NPHphenelzine increases effects of insulin NPH by unknown mechanism. Use Caution/Monitor.insulin regular humanphenelzine increases effects of insulin regular human by unknown mechanism. Use Caution/Monitor.lasmiditanlasmiditan, phenelzine. Either increases effects of the other by sedation. Use Caution/Monitor. Coadministration of lasmiditan and other CNS depressant drugs, including alcohol have not been evaluated in clinical studies. Lasmiditan may cause sedation, as well as other cognitive and/or neuropsychiatric adverse reactions.phenelzine increases effects of lasmiditan by serotonin levels. Use Caution/Monitor. Coadministration may increase risk of serotonin syndrome.lemborexantlemborexant, phenelzine. Either increases effects of the other by sedation. Modify Therapy/Monitor Closely. Dosage adjustment may be necessary if lemborexant is coadministered with other CNS depressants because of potentially additive effects.levocetirizinephenelzine increases effects of levocetirizine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .lithiumlithium, phenelzine. Mechanism: unknown. Use Caution/Monitor. Risk of malignant hyperpyrexia. Interactions esp. expected w/non selective MAOIs.loratadinephenelzine increases effects of loratadine by Other (see comment). Modify Therapy/Monitor Closely. Comment: Coadministration of phenelzine and antihistamines may result in additive CNS depressant effects. MAO inhibitors also prolong and intensify anticholinergic effects of antihistamines. .loxapinephenelzine, loxapine. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).loxapine inhaledphenelzine, loxapine inhaled. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).lurasidonelurasidone increases effects of phenelzine by Other (see comment). Use Caution/Monitor. Comment: Potential for increased risk of hypotension with concurrent use. Monitor blood pressure and adjust dose of antihypertensive agent as needed.lurasidone, phenelzine. Either increases toxicity of the other by sedation. Use Caution/Monitor. Potential for increased CNS depressant effects when used concurrently; monitor for increased adverse effects and toxicity.phenelzine, lurasidone. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).metforminphenelzine will increase the level or effect of metformin by unspecified interaction mechanism. Use Caution/Monitor.metrizamidephenelzine, metrizamide. Mechanism: unspecified interaction mechanism. Use Caution/Monitor. Risk of seizure. D/C MAO inhibitor 24h before admin. of metrizamide.molindonephenelzine, molindone. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).olanzapinephenelzine, olanzapine. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).oliceridinephenelzine, oliceridine. Either increases effects of the other by serotonin levels. Modify Therapy/Monitor Closely. If concomitant use is warranted, carefully monitor, particularly during treatment initiation and dose adjustment. Discontinue oliceridine if serotonin syndrome is suspected. .olodaterol inhaledphenelzine and olodaterol inhaled both increase QTc interval. Use Caution/Monitor. MAO inhibitors prolong the QTc interval and may potentiate the effects of beta2 agonists on the cardiovascular system; increased risk of ventricular arrhythmiasopium tinctureopium tincture, phenelzine. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Risk of serotonin syndrome.oxymetazoline topicaloxymetazoline topical and phenelzine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.paliperidonephenelzine, paliperidone. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).perphenazinephenelzine, perphenazine. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status changes, autonomic instability, and neuromuscular hyperactivity) or neuroleptic malignant syndrome (eg, hyperthermia, muscle rigidity, autonomic dysfunction).phenylephrine ophthalmicphenelzine increases effects of phenylephrine ophthalmic by pharmacodynamic synergism. Use Caution/Monitor. Some systemic absorption of ophthalmic phenylephrine; reduce dose within 21 days of MAO inhibitors.pimavanserinphenelzine, pimavanserin. unspecified interaction mechanism. Use Caution/Monitor. Serotonin modulators may enhance dopamine blockade, possibly increasing the risk for neuroleptic malignant syndrome. Antipsychotics may enhance serotonergic effect of serotonin modulators, which may result in serotonin syndrome. Monitor for evidence of serotonin toxicity (eg, mental status