Off-label drugs are medications that may be FDA approved for one indication (disease or sickness) but are used for other things too.
Doctors sometimes prescribe drugs for “off-label” uses because they may be cheaper or more convenient in different doses.
In the world of ED, the most common example is sildenafil, the chemical name for Viagra.
Sildenafil is approved in 25, 50, and 100mg doses and tablets for ED, but it’s also approved in a 20mg tablet for pulmonary arterial hypertension.
With sildenafil, taking five 20mg tablets is equivalent to a 100mg tablet of Viagra’s dosage, but at a fraction of the cost.