side effects to FDA at 1-800-FDA-1088. Adverse effects reported during postmarketing experience with cefdinir, regardless of causality, have included fever , shock , feeling of suffocation , and facial and laryngeal edema . Nervous system side effects have included headache (2%), dizziness (0.3%), insomnia (0.2%), asthenia (0.2%), and somnolence (0.2%). Some