This unlicensed treatment is applied directly to the scalp and is generally well tolerated. As with all medicines, some people may experience side effects.
The most common side effects are local and may include itching, dryness, redness, flaking, or mild irritation at the application site.
Some individuals may notice increased hair shedding during the first few weeks of use. This is usually temporary and can be a sign that the treatment is beginning to take effect.
A small amount of the medication can be absorbed into the bloodstream. As a result, less common side effects may include reduced libido, difficulty maintaining an erection, headaches, dizziness, or a faster heart rate.
Rarely, some individuals may experience mood changes, breast tenderness, or unwanted hair growth in areas such as the face if the product comes into contact with surrounding skin.
Finasteride is not recommended when trying to conceive. As a precaution, it is advised to stop treatment at least 3 months before planning a pregnancy.
If you experience persistent irritation, significant dizziness, rapid heartbeat, low mood, or any concerning symptoms, you should stop treatment and seek medical advice.