Symmetrel side effects

If you experience any of the following serious side effects, stop taking Symmetrel and seek emergency medical attention:

• an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives);
• congestive heart failure (swelling in your lower legs or feet, difficulty breathing, fatigue);
• severe stiffness or involuntary movements of your arms or legs; or
• confusion after discontinuing Symmetrel or after a dose reduction.

Other, less serious side effects are more likely to occur. Continue to take Symmetrel and talk to your doctor if you experience

• dizziness, lightheadedness, drowsiness, or a headache;
• insomnia;
• nausea or decreased appetite;
• dry mouth or constipation; or
• depression, anxiety, or confusion.

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.