Delayed ejaculation is a common side effect of phosphodiesterase type 5 inhibitors (PDE5-Is), which are prescribed to treat erectile dysfunction. Examples of PDE5-Is are Viagra, Cialis, and Levitra.
Researchers have investigated whether PDE5-Is can be used to treat premature ejaculation. There have been some positive findings, but more study is needed.
Currently, these drugs are not used to treat premature ejaculation.