Stop taking  Tessalon Perles and get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
severe drowsiness or dizziness;
confusion, hallucinations.
ongoing numbness or tingling in your mouth, throat, or face;
numbness in your chest;
a choking feeling;
chills; or
burning in your eyes.
Some of these side effects may result from chewing or sucking on a Tessalon Perles capsule.
Common side effects may include:
headache, dizziness;
nausea, upset stomach;
constipation;
itching, rash; or
stuffy nose.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Tessalon Perles side effects (more detail)
