PROBLEM TO BE SOLVED: To obtain the subject erection function deficiency ameliorator that includes L-arginine and caffeine and safely develops excellent effect.
SOLUTION: This erection function deficiency ameliorator includes (A) L- arginine or the salts thereof and (B) caffeine and the salts thereof. As a salt of the components A and B, are cited mineral acid salt, for example, hydrochloride, sulfate, nitrate or the like, organic acid salts, for example, acetate, citrate or the like. The weight ratio of the component A to the component B in the ameliorator is preferably 99.95/0.05-33/67, and particularly 99.5/0.5-80/20. The proper dose is orally 0.2-5 g per one administration. In the case of transdermal patch, a tape including 0.02-1 g in the total of the components A and B. In the case of liniment, the dose is 0.02-1 g and is used in the form of ointment, cream or the like.