Cefdinir Dosage
Calculate the correct cefdinir (Omnicef) dosage for adults and children based on weight, medical indication, and kidney function. Free antibiotic dosing calculator with charts and suspension volume.
About This Calculator
The Cefdinir Dosage Calculator helps determine the appropriate dose of cefdinir (brand name Omnicef), a third-generation cephalosporin antibiotic used to treat a variety of bacterial infections. This calculator is intended for healthcare providers, pharmacists, caregivers, and patients who need to verify prescribed dosing based on FDA-approved guidelines from the manufacturer's prescribing information.
Cefdinir is indicated for community-acquired pneumonia (CAP), acute exacerbations of chronic bronchitis, acute maxillary sinusitis, pharyngitis/tonsillitis, uncomplicated skin and skin structure infections, and acute bacterial otitis media (primarily in pediatric patients). The calculator uses weight-based dosing for children (7 mg/kg every 12 hours or 14 mg/kg every 24 hours, capped at 42 kg / 600 mg daily) and fixed dosing for adults (300 mg every 12 hours or 600 mg every 24 hours). For patients with impaired kidney function (CrCl below 30 mL/min), doses are adjusted to a maximum of 300 mg once daily.
The calculator also computes the volume of oral suspension needed for pediatric patients, supporting both the 125 mg/5 mL and 250 mg/5 mL suspension strengths. This is particularly useful for parents and caregivers who need to measure precise liquid doses for children.
Regional Notes
India: Cefdinir is widely available as a generic antibiotic under various brand names. The standard dosing guidelines follow international FDA/EMA recommendations. Cefdinir is typically prescribed for 5-10 days depending on the indication. Always consult with a registered medical practitioner before use.
US: Cefdinir (Omnicef) is FDA-approved and available by prescription only. The dosing information in this calculator is derived from the FDA-approved labeling (NDA 050739, last updated 2007). Generic cefdinir is available and covered by most insurance plans including Medicare Part D.
UK: Cefdinir is not as commonly prescribed in the UK as other cephalosporins (e.g., cefalexin) but is available on prescription for specific infections when other antibiotics are not suitable. The dosing follows the same evidence-based guidelines used internationally. NICE guidelines recommend antibiotic stewardship — cefdinir should only be used when bacterial infection is confirmed or strongly suspected.
Disclaimer: This calculator is for informational and educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before administering any medication.
Frequently Asked Questions
What is cefdinir (Omnicef) and how does it work?
Cefdinir is a third-generation cephalosporin antibiotic used to treat bacterial infections such as pneumonia, sinusitis, bronchitis, pharyngitis, tonsillitis, skin infections, and otitis media. It works by interfering with bacterial cell wall synthesis, causing the bacteria to rupture and die. Cefdinir is available as 300 mg capsules and as an oral suspension (125 mg/5 mL or 250 mg/5 mL) under the brand name Omnicef and generics.
How is the correct cefdinir dosage calculated for adults?
For adults with normal kidney function, the standard cefdinir dose is 300 mg every 12 hours (600 mg daily). Some indications like sinusitis and pharyngitis allow 600 mg once daily instead. For community-acquired pneumonia and skin infections, only the twice-daily regimen is approved. The maximum daily dose is 600 mg. For patients with creatinine clearance below 30 mL/min, the dose should be reduced to 300 mg once daily.
How is cefdinir dosage calculated for children?
For children 6 months to 12 years weighing up to 42 kg, the cefdinir dose is weight-based at 7 mg per kg every 12 hours or 14 mg per kg every 24 hours (when once-daily dosing is approved for the indication). If the child weighs more than 42 kg, the dose is capped at the adult level of 300 mg twice daily or 600 mg once daily. For children with impaired kidney function (CrCl <30 mL/min), the dose should not exceed 7 mg/kg once daily with a maximum of 300 mg.
What is the suspension volume for pediatric cefdinir dosing?
Cefdinir oral suspension comes in two strengths: 125 mg per 5 mL (25 mg/mL) and 250 mg per 5 mL (50 mg/mL). To calculate the volume, divide the prescribed dose in mg by the concentration in mg/mL. For example, a 154 mg dose using the 125 mg/5 mL strength requires 154 ÷ 25 = 6.2 mL. Always use the provided measuring device for accuracy.
Can I drink alcohol while taking cefdinir?
You should avoid combining cefdinir therapy with alcohol consumption. Alcohol can exacerbate side effects such as drowsiness, dizziness, vomiting, and stomach upset. It may also interfere with your body's ability to fight the infection.
Does cefdinir affect birth control?
Although the interaction between cefdinir and hormonal birth control is not definitively established, it is best to use an additional barrier contraception method (such as condoms) during the course of cefdinir and for one week after completing therapy.
What are the common side effects of cefdinir?
Common side effects of cefdinir include diarrhea (15%), nausea, vaginal yeast infections, headache, and abdominal pain. Less common side effects include rash, vomiting, and loose stools. In the US and UK, serious allergic reactions are rare but require immediate medical attention. In India, cefdinir is widely available and the side effect profile is consistent with global data.
How should cefdinir suspension be stored?
Cefdinir oral suspension should be stored at room temperature (20-25°C / 68-77°F). Do not refrigerate as the suspension may thicken. Shake the bottle well before each use. Any unused suspension should be discarded after 10 days. Cefdinir capsules should be stored at room temperature away from moisture and heat.