Penicillin VK dosing for odontogenic infection is commonly which regimen?

• A. 250 mg four times daily for 5-7 days.
• B. 500 mg twice daily for 3-5 days.
• C. 250 mg three times daily for 7-10 days.
• D. 500 mg four times daily for 5-7 days.

Answer: (D)

Penicillin VK works best for odontogenic infections when the drug level stays above the bacteria’s MIC long enough to clear the infection. That requires a dose and dosing interval that maintain effective concentrations throughout the day. The standard adult regimen is 500 mg taken by mouth every 6 hours for 5–7 days. This results in about 2 grams per day with good oral bioavailability, keeping tissue levels above the needed threshold and providing reliable coverage of common dental pathogens like viridans streptococci and oral anaerobes. The 5–7 day duration balances efficacy with safety, reducing the risk of resistance and adverse effects while ensuring the infection has time to resolve. Regimens with lower daily totals or less frequent dosing can fail to maintain adequate levels, making them less appropriate for typical odontogenic infections.