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.

Check with your doctor immediately if the following side effects occur, because they may mean that you are developing a problem with blood circulation:

Less common or rare

Anxiety or confusion (severe); change in vision; chest pain; increase in blood pressure; pain in arms, legs, or lower back, especially if pain occurs in your calves or heels while you are walking; pale, bluish-colored, or cold hands or feet (not caused by cold temperatures and occurring together with other side effects listed in this section); red or violet-colored blisters on the skin of the hands or feet

Also check with your doctor immediately if any of the following side effects occur since they may be symptoms of an overdose:

Convulsions (seizures); diarrhea, nausea, vomiting, or stomach pain or bloating (severe) occurring together with other signs of overdose or of problems with blood circulation; dizziness, drowsiness, or weakness (severe), occurring together with other signs of overdose or of problems with blood circulation; fast or slow heartbeat; shortness of breath; unusual excitement

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

More common

Swelling of face, fingers, feet, and/or lower legs

Less common or rare

Skin rash, hives, or itching; sore throat and fever; unusual bleeding or bruising; weakness in legs; yellow eyes or skin

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

Constipation; decreased sweating; dizziness or lightheadedness; drowsiness; dryness of mouth, nose, throat, or skin

Less common or rare

Blurred vision, diarrhea, nausea, or vomiting (occurring without other signs of overdose or blood circulation problems); difficult urination (especially in older men); difficulty in swallowing; increased sensitivity of eyes to sunlight; loss of memory; reduced sweating; unusual excitement (especially in older adults); unusual tiredness or weakness

After you stop taking this medicine, your body may need time to adjust. The length of time this takes depends on the amount of medicine you were taking and how long you took it. During this time check with your doctor if your headaches or other symptoms begin again or worsen.

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