Which antibiotic is commonly used to treat soft tissue infections in the oral region as first-line therapy?

• A. Amoxicillin
• B. Erythromycin
• C. Clindamycin
• D. Pen VK

Answer: (D)

Penicillin VK is chosen as first-line for soft tissue infections in the oral region because it effectively targets the bacteria most commonly involved—Streptococcus species and anaerobes found in dental infections—while being well absorbed when taken by mouth. Its acid-stable formulation provides reliable systemic levels with a relatively narrow spectrum, which helps spare the normal oral flora and lowers the risk of promoting widespread resistance. A typical regimen is 500 mg taken by mouth every 6 hours for about 5–7 days, adjusted for severity and patient factors. It’s inexpensive, has a strong safety profile, and is well tolerated. If penicillin cannot be used due to allergy, alternatives like clindamycin or erythromycin are considered, though they come with drawbacks such as higher risk of C. difficile with clindamycin and limited anaerobic coverage with macrolides; amoxicillin can be an option in some cases, but Penicillin VK remains the preferred initial choice for odontogenic soft tissue infections because of its targeted effectiveness and safety.