Side Effects of This Medicine

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

The following side effects may mean that a serious allergic reaction is occurring. Check with your doctor or get emergency help immediately if they occur, especially if several of them occur at the same time.

Less common or rare

Bluish discoloration or flushing or redness of skin (occurring together with other effects listed in this section); coughing, shortness of breath, troubled breathing, tightness in chest, or wheezing; difficulty in swallowing; dizziness or feeling faint (severe); hive-like swellings (large) on eyelids, face, lips, or tongue; skin rash, itching, or hives; stuffy nose (occurring together with other effects listed in this section)

Also check with your doctor immediately if any of the following side effects occur, especially if several of them occur together:

Rare

Bleeding or crusting sores on lips; chest pain; fever with or without chills; red, thickened, or scaly skin; sores, ulcers, or white spots in mouth (painful); sore throat (unexplained); tenderness, burning, or peeling of skin

Symptoms of overdose

Anxiety, confusion, excitement, irritability, nervousness, restlessness, or trouble in sleeping (severe, especially with products containing caffeine); convulsions (seizures, with products containing caffeine); diarrhea (severe or continuing); dizziness, lightheadedness, drowsiness, or weakness (severe); frequent urination (for products containing caffeine); hallucinations (seeing, hearing, or feeling things that are not there); increased sensitivity to touch or pain (for products containing caffeine); increased thirst; muscle trembling or twitching (for products containing caffeine); nausea or vomiting (severe or continuing), sometimes with blood; ringing or buzzing in ears (continuing) or hearing loss; seeing flashes of ``zig-zag'" lights (for products containing caffeine); slow, fast, or irregular heartbeat; slow, fast, irregular, or troubled breathing; slurred speech; staggering; stomach pain (severe); uncontrollable flapping movements of the hands, especially in elderly patients; unusual movements of the eyes; vision problems

Also, check with your doctor as soon as possible if any of the following side effects occur:

Less common or rare

Bloody or black, tarry stools; bloody urine; confusion or mental depression; muscle cramps or pain; pinpoint red spots on skin; swollen or painful glands; unusual bleeding or bruising; unusual excitement (mild)

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:

More common

Bloated or ``gassy'" feeling; dizziness or lightheadedness (mild); drowsiness (mild); heartburn or indigestion; nausea, vomiting, or stomach pain (occurring without other symptoms of overdose)

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.