Omnicef Side Effects: Quick Guide to What Happens and What to Do

Omnicef (cefdinir) is a popular antibiotic for ear, throat, and skin infections. Most people finish a course without drama, but like any drug it can cause unwanted reactions. Knowing what’s normal and what’s a red flag helps you stay safe and finish treatment without unnecessary worries.

Common Omnicef Reactions

About a quarter of users notice at least one mild symptom. The most frequent ones include:

• Stomach upset: nausea, mild cramps, or a loose stool. Often it eases if you take the pill with food.
• Diarrhea: watery stools that may last a few days. If it’s severe or you see blood, it could be a sign of C. diff infection – call your doctor.
• Headache: a dull ache that usually fades after a couple of doses.
• Dizziness or light‑headedness: feel a bit wobbly? Sit down, drink water, and keep an eye on it.
• Rash or mild itching: a small, flat rash often goes away on its own.

These side effects are generally harmless and disappear once the medication is stopped. Staying hydrated, eating a light snack before the dose, and avoiding alcohol can cut down on discomfort.

When a Reaction Needs Emergency Attention

Serious reactions are rare, but you should act fast if you notice any of these signs:

• Severe skin rash: blistering, peeling, or a rash that spreads quickly.
• Swelling: especially around the face, lips, tongue, or throat – could indicate an allergic reaction.
• Breathing trouble: wheezing, tight chest, or shortness of breath.
• Fast or irregular heartbeat.
• Persistent vomiting or diarrhea lasting more than 48 hours.