The commonly used erection-boosting drugs are type 5 phosphodiesterase inhibitors, such as sildenafil, vardenafil, tadalafil, etc. It is generally safe to take the drugs as prescribed by your doctor, i.e. in regular doses. There may also be adverse reactions, so-called side effects, such as palpitations, hypotension, vomiting, dry mouth, thirst, arthralgia, allergic reactions, etc. There may also be impairment of liver and kidney function. If such drugs are taken together with nitrates, severe hypotension may occur, and if the dose of a single dose is too high, the adverse reaction event will be more obvious. Any drug has adverse reactions, and as a drug for erectile dysfunction has a therapeutic effect, it also has a side effect side.