Pharmacology A drug effect that is produced by therapeutic doses of both timolol and amiodarone is blockade of: A Cardiac Na+ channels B Cardiac K+ channels C Beta adrenoceptors D Alpha-adrenoceptors 💡 Explanation A drug effect that is produced by therapeutic doses of both timolol and amiodarone is blockade of: ✓ Correct Answer: C. Beta adrenoceptors