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Talk to your doctor and pharmacist before taking any prescription or over-the-counter medicines, including vitamins, minerals, and herbal products.

If you experience any of the following serious side effects, stop taking acamprosate and contact your doctor immediately or seek emergency medical treatment:

• an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives);

• an irregular heartbeat or pulse;

• low blood pressure (dizziness, weakness);

• high blood pressure (severe headache, blurred vision);

• chills or fever;

• unusual bleeding or bruising;

• a rash or hives.

If you experience any of the following less serious side effects, continue taking acamprosate and talk to your doctor:

• headache, tremor, nervousness, or anxiety;

• stomach pain, constipation, increased appetite, weight gain;

• amnesia, abnormal thinking, tremor, flushing;

• abnormal vision, difficulty tasting; or

• decreased sex drive or impotence.

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.