Pharmacology Methanamine salts are used as urinbary antiseptics. The reason theylack systemic antibacterial action is that they are: A Not absorbed into systemic circulation after oral use B Rapidly metabolized by liver drug metabolizing enzymes C Conveed to formaldehyde at low urinary pH D Substrates for active tubular secretion 💡 Explanation Methanamine salts are used as urinbary antiseptics. The reason theylack systemic antibacterial action is that they are: ✓ Correct Answer: C. Conveed to formaldehyde at low urinary pH