phenelzine Interactions Should I avoid certain foods while taking phenelzine?phenelzine may interact with the following foods: Most Significant: A change in your diet, medicine, or dosage is likely to be necessary. Promptly consult your doctor or pharmacist. AVOID HIGH TYRAMINE FOODS. Important: Possible changes in your diet, medicine, or dosage should be discussed with your doctor or pharmacist. LIMIT FOODS HIGH IN TRYPTOPHAN AT ONE MEAL.