Metronidazole (Systemic)

Brand Names : Flagyl, Flagyl 375, Flagyl ER, Flagyl I.V., Flagyl I.V. RTU, Metric 21, Metro I.V., Protostat, Apo-Metronidazole, Novonidazol, Trikacide

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 any of the following side effects occur:

Less common

Numbness, tingling, pain, or weakness in hands or feet

Rare

Convulsions (seizures)

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

Less common

Any vaginal irritation, discharge, or dryness not present before use of this medicine; black, tarry stools; blood in urine or stools; clumsiness or unsteadiness; frequent or painful urination; inability to control urine flow; mood or other mental changes; nausea and vomiting; pinpoint red spots on skin; sense of pelvic pressure; skin rash, hives, redness, or itching; sore throat and fever; stomach and back pain (severe); unusual bleeding or bruising

For injection form

Pain, tenderness, redness, or swelling over vein in which the medicine is given

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

Diarrhea; dizziness or light-headedness; headache; loss of appetite; nausea or vomiting; stomach pain or cramps

Less common or rare

Change in taste sensation; dryness of mouth; unpleasant or sharp metallic taste

In some patients metronidazole may cause dark urine. This is only temporary and will go away when you stop taking this medicine.

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