What side effects can this medication cause?
If you experience any of the following serious side effects, contact your doctor immediately or seek emergency medical treatment:
an allergic reaction (difficulty breathing, closing of the throat, swelling of the lips, face, or tongue, or hives)
seizures
a fast or irregular heartbeat
a heart attack
high blood pressure (blurred vision, severe headache)
difficulty urinating
fever with increased sweating
muscle stiffness, or severe muscle weakness
Other, less serious side effects may be more likely to occur. Continue to take protriptyline and talk to your doctor if you experience:
drowsiness or dizziness
dry mouth and eyes
constipation
mild tremor
sweating
mild agitation, weakness, or headache
ringing in the ears
nausea
loss of weight or appetite
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.
Why is this medication prescribed?
Dosage and using this medicine
What special precautions should I follow?
What should I do if I forget a dose?