Olmesartan and valsartan do not have which one is more effective, it is recommended to choose the right drug for yourself under the guidance of your doctor. Olmesartan and valsartan are both blood pressure-lowering drugs, and both belong to the angiotensin receptor antagonist, and their antihypertensive mechanism of action is relatively similar, but their indications, contraindications and adverse reactions are still somewhat different, and the sensitivity of different patients to the drug will also be different, so patients should choose the most suitable drug for their use. Olmesartan is commonly used in the treatment of hypertensive patients, after the use of back pain, chest pain, headache, diarrhea, hematuria, malaise, peripheral edema, dizziness, nausea, tachycardia and other adverse reactions, allergy to the drug is prohibited. Valsartan is indicated for mild to moderate hypertension, especially for patients intolerant to ACE (angiotensin converting enzyme) inhibitors. Adverse reactions such as headache, dizziness, cough, diarrhea, fatigue, rhinitis, pharyngitis, and arthralgia may occur with use. It is contraindicated in people who are allergic to the drug, patients with severe renal failure, pregnant and lactating women. The use of drugs need to be under the guidance of a doctor, it is recommended not to blindly use the drug on their own to avoid adverse reactions.