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There are many other medicines that can cause serious or life-threatening medical problems if you take them together with isocarboxazid. Do not take isocarboxazid before telling your doctor about all other prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor. Keep a list with you of all the medicines you use and show this list to any doctor, dentist, or other healthcare provider who treats you.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have any new or worsening symptoms such as: mood or behavior changes, anxiety, panic attacks, trouble sleeping, or if you feel impulsive, irritable, agitated, hostile, aggressive, restless, hyperactive (mentally or physically), more depressed, or have thoughts about suicide or hurting yourself.

Stop using isocarboxazid and call your doctor at once if you have any of these serious side effects:

• sudden and severe headache, rapid heartbeat, stiffness in your neck, nausea, vomiting, cold sweat, sweating, vision problems, sensitivity to light;

• chest pain, fast or slow heart rate;

• swelling, rapid weight gain;

• jaundice (yellowing of the skin or eyes); or

• feeling light-headed, fainting.

Continue taking this medication and talk to your doctor if you have any of these less serious side effects:

• dizziness, headache;

• tremors or shaking;

• constipation,nausea; or

• dry mouth.

Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.