Drug:
Esgic - Headache / Migraine / Pain Reliever

Side effects: (24)

Allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives);
Slow, weak breathing;
Liver damage (yellowing of the skin or eyes, nausea, abdominal pain or discomfort, unusual bleeding or bruising, severe fatigue);
Blood problems (easy or unusual bleeding or bruising);
Low blood sugar (fatigue, increased hunger or thirst, dizziness, or fainting).
Drowsiness
Dizziness
Confusion or lightheadedness
Shortness of breath
Dry mouth
Nausea
Vomiting
Abdominal pain
Decreased appetite
Tiredness
Leg pain, or muscle weakness
Agitation
Irritability
Nervousness
Anxiety or excitability
Rash or itching
Feeling of intoxication
Headache
Constipation

Precautions: (6)
Use caution when driving, operating machinery, or performing other hazardous activities. Butalbital will cause drowsiness or dizziness. If you experience drowsiness or dizziness, avoid these activities. ? Avoid sleeping pills, antihistamines, sedatives, and tranquilizers except under the supervision of your doctor. These may also make you drowsy. ? Avoid alcohol. Alcohol taken during therapy with acetaminophen and butalbital can be very damaging to your liver and can increase drowsiness and dizziness. ? Check the acetaminophen content of other over-the-counter and prescription products while taking this medication. You should not exceed 4 grams (4000 mg) of acetaminophen per day. ? Avoid taking too much caffeine. Check the caffeine content of other over-the-counter and prescription products as well as beverages (coffee, tea, and colas) while taking this medication

Source:
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http://www.grand-medications.com/Esgic/