Medicine A patient has serum creatinine of 150-300 micromol/L. Which of the following require dosage reduction: March 2011 A Ampicillin B Isoniazid C Gentamycin D Penicillin 💡 Explanation A patient has serum creatinine of 150-300 micromol/L. Which of the following require dosage reduction: March 2011 ✓ Correct Answer: C. Gentamycin