Flagyl ER – What It Is and When to Use It

Flagyl ER is the extended‑release form of metronidazole, an antibiotic that fights infections caused by certain bacteria and parasites. Doctors prescribe it for conditions like bacterial vaginosis, pelvic inflammatory disease, and some stomach infections (like Clostridioides difficile). Because it releases the medicine slowly, you usually take it once a day instead of multiple doses.

How to Take Flagyl ER

Take the tablet with a full glass of water, preferably with food to reduce stomach upset. Don’t crush, split, or chew it—doing that messes up the slow‑release coating and can cause side effects. Follow your doctor’s instructions exactly; the typical adult dose is 500 mg once daily for 7‑10 days, but the length can change based on the infection.

If you miss a dose, take it as soon as you remember unless it’s almost time for the next one. In that case, skip the missed tablet and continue with your regular schedule. Never double up on doses.

Common Side Effects and When to Call the Doctor

Most people feel fine, but a few experience nausea, a metallic taste, or mild stomach cramps. These usually pass as your body gets used to the medication. Watch out for more serious signs like severe diarrhea, rash, itching, or difficulty breathing—those could mean an allergic reaction and need immediate medical help.

Alcohol can cause a nasty reaction with metronidazole (flushing, rapid heartbeat, nausea). It’s safest to avoid all alcoholic drinks and products containing alcohol while you’re on Flagyl ER and for at least 48 hours after finishing the course.

Another important warning: Flagyl ER can affect your liver. If you notice yellowing of the skin or eyes, dark urine, or persistent fatigue, contact your doctor right away.

Pregnant women should only use Flagyl ER if the benefits outweigh the risks. Talk to your doctor if you’re planning a pregnancy or are breastfeeding.

Store the tablets at room temperature, away from moisture and heat. Keep them out of reach of children.

Having a clear plan for taking Flagyl ER makes the treatment smoother and reduces the chance of side effects. Always read the patient information leaflet, ask your pharmacist any questions, and never share your medication with someone else.

Bottom line: Flagyl ER works well for specific infections, but it’s essential to follow dosing instructions, avoid alcohol, and watch for warning signs. With the right approach, you’ll beat the infection safely and get back to feeling normal.