Minocycline: A Tetracycline With a Twist — Treating Mild Diabetic Foot Infections and Mood?

Dr. G explores minocycline, a tetracycline antibiotic useful for mild skin and soft tissue diabetic foot infections, particularly when MRSA is a concern. Key points include dosing (100 mg PO q12h), limited streptococcal and anaerobic coverage, contraindications (pregnancy, children, severe liver disease), common and serious side effects (dizziness, hyperpigmentation, autoimmune hepatitis, intracranial hypertension), and important drug interactions. Minocycline has good oral bioavailability and skin penetration and may have adjunctive neuro-anti-inflammatory effects that could modestly improve mood when added to antidepressant therapy, but it should not replace standard depression treatment or be used to extend antibiotic duration. Use primarily for mild infections with close reassessment within 48–72 hours and consider pairing with a beta-lactam when streptococcal coverage is needed.

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