Renhe is the brand name and the generic name is sildenafil citrate tablets, which are effective for erectile dysfunction, but there are individual differences in efficacy. Sildenafil citrate tablets enhance the nitric oxide (NO)-cGMP pathway through selective inhibition of PDE5, elevate cGMP levels and lead to relaxation of penile cavernous smooth muscle, so that patients with erectile dysfunction produce a natural erectile response to sexual stimulation. It can effectively promote erection in people with erectile dysfunction. Maximum blood concentration can be reached half an hour to two hours after oral administration. However, there are individual differences in efficacy depending on the individual’s physical condition, sensitivity to the drug, and the extent of the condition. Adverse reactions such as rash, dizziness, headache, nausea, diarrhea, visual disturbances, urinary tract infections, back pain, and myalgia have been seen with this product. It is contraindicated in people with known hypersensitivity to any of the ingredients in this product, patients taking any form of nitrates, guanylate cyclase stimulators, women, children and other people. The drug is a prescription drug and should be used in strict compliance with the doctor’s instructions.