What are the differences in drugs used by different countries to increase penile hardness?

There is no unified and widely recognized standard list globally for drugs that increase penile hardness due to their involvement in personal privacy and sensitive topics. In addition, different countries and regions may have different drug regulatory policies and market access mechanisms, which may also lead to differences in the availability and names of certain drugs in different countries. For the treatment of erectile dysfunction (ED), some common drug categories are widely used globally, such as phosphodiesterase 5 (PDE5) inhibitors. The main function of these drugs is to help improve blood flow, thereby enhancing the erection hardness of the penis. The specific drug name, dosage form, usage method, and side effects may vary depending on the country/region.