Immunization Side Effects

Flagyl Side Effects

Not much is known about the potential side effects of short-acting Flagyl. Side effects that have been reported with Flagyl ER (the long-acting version) include flu-like symptoms, headaches, and nausea. Certain side effects of Flagyl are potentially serious and should be reported to your healthcare provider immediately, including numbness or paralysis of a limb, seizures, or signs of an allergic reaction (such as itching or hives).

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Flagyl:

Appetite loss; constipation; diarrhea; dizziness; headache; metallic taste; nausea; stomach upset; vomiting.
Seek medical attention right away if any of these SEVERE side effects occur when using Flagyl:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); bloody stools; decreased coordination; increased or decreased urination; numbness, tingling, or burning of the arms, hands, legs, or feet; red, swollen, blistered, or peeling skin; seizures; severe diarrhea; severe or persistent dizziness or headache; sore throat, chills, or fever; speech problems; stiff neck; stomach pain or cramps; vaginal itching, odor, or discharge; vision loss or other vision changes; white patches in the mouth.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.

Flagyl Capsules

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Flagyl Capsules:

Appetite loss; constipation; diarrhea; dizziness; headache; metallic taste; nausea; stomach upset; vomiting.
Seek medical attention right away if any of these SEVERE side effects occur when using Flagyl Capsules:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); bloody stools; decreased coordination; increased or decreased urination; numbness, tingling, or burning of the arms, hands, legs, or feet; red, swollen, blistered, or peeling skin; seizures; severe diarrhea; severe or persistent dizziness or headache; sore throat, chills, or fever; speech problems; stiff neck; stomach pain or cramps; vaginal itching, odor, or discharge; vision loss or other vision changes; white patches in the mouth.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.

Flagyl ER Extended-Release Tablets

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome when using Flagyl ER Extended-Release Tablets:

Appetite loss; constipation; diarrhea; dizziness; headache; metallic taste; nausea; stomach upset; vomiting.
Seek medical attention right away if any of these SEVERE side effects occur when using Flagyl ER Extended-Release Tablets:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); bloody stools; decreased coordination; increased or decreased urination; numbness, tingling, or burning of the arms, hands, legs, or feet; red, swollen, blistered, or peeling skin; seizures; severe diarrhea; severe or persistent dizziness or headache; sore throat, chills, or fever; speech problems; stiff neck; stomach pain or cramps; vaginal itching, odor, or discharge; vision loss or other vision changes; white patches in the mouth.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. To report side effects to the appropriate agency, please read the Guide to Reporting Problems to FDA.