Pharmacology A patient of renal failure has been diagnosed with cholera, so which of the tetracyclines is most suitable for the patient: A Minocycline. B Doxycycline. C Oxytetracycline. D All of the above. 💡 Explanation A patient of renal failure has been diagnosed with cholera, so which of the tetracyclines is most suitable for the patient: ✓ Correct Answer: B. Doxycycline.