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Side effects of cefdinir may develop during the treatment process, including headache, stomach pain, diarrhea, and yeast infection in women. Although most side effects are generally mild, some side effects can indicate something serious and require immediate medical attention. These include blurred vision, blood in the stools, or hives. However, most people have no problems with side effects of cefdinir and tolerate the drug quite well.

Side Effects of Cefdinir: An Introduction

As with any medicine, side effects are possible with cefdinir (Omnicef®). However, not everyone who takes the drug will experience problems. In fact, most people tolerate cefdinir quite well. If side effects do occur, they are generally minor and either require no treatment or can easily be treated by you or your healthcare provider. In previous research studies, up to 3 percent of adults or adolescents and 2 percent of children stopped taking cefdinir because of side effects.
(The side effects of cefdinir discussed below are not a complete list of reported side effects. Your healthcare provider can discuss a more complete list with you.)

Common Side Effects of Cefdinir

Cefdinir has been studied extensively in clinical trials, with thousands of people worldwide having been evaluated. In these studies, side effects are always documented. The most common side effects of cefdinir seen in either adults or children included:
  • Diarrhea -- up to 15 percent
  • Yeast infection -- up to 4 percent of women
  • Nausea -- up to 3 percent
  • Headache -- up to 2 percent
  • Unexplained rash -- up to 3 percent
  • Vomiting -- up to 1 percent
  • Stomach pain -- up to 1 percent.
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Last reviewed by: Kristi Monson, PharmD;
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