You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is All of the following are vasodilators except and explain in detail?
Methyldopa is a centrally acting alpha-agonist Hydralazine, diazoxide, and nitroprusside are vasodilators. Hydralazine, diazoxide- aeriolar dilators- potassium channel openers Nitroprusside- both aeriolar and venous dilator REF.Essentials of Medical Pharmacology-kD Tripathi 8th ed.