Viagra refers to sildenafil citrate, and sartan antihypertensive drugs can not be used together with it. Sartan antihypertensive drugs are angiotensin II receptor antagonists, commonly used clinical drugs such as chlorosartan and irbesartan, which can promote vasodilation to achieve the expansion of peripheral vasculature and lower blood pressure, while sildenafil citrate, although it is a drug for treating erectile dysfunction of the penis, but it has an effect on the blood pressure, which can cause low blood pressure, and thus the two drugs can not be used together. Note that any dosage form of nitrates is contraindicated when taking sildenafil citrate. Sartan antihypertensive drugs belong to the long-acting antihypertensive drugs, which should be taken regularly on time, and this product is forbidden for pregnant women and patients with severe hepatic or renal insufficiency and hyperkalemia. The medication should be taken under the guidance of a doctor, it is not recommended to take the medication by yourself.