In today's world, there is hardly a medication without side effects. Even common pills like aspirin have undesired side effects, so it seems that we have already got used to the fact that there is no good without a bit of evil. Hair loss medications, especially Propecia are no exception to the rule and they also have their side effects.
The side effects of Propecia are not a health risk, though under some circumstances they can be a bit unpleasant. One of the most common side effects of Propecia are minor sexual dysfunctions. This is not surprising because since Propecia affects the levels of the male hormone testosterone, it is quite logical that this will become noticeable in other ways, besides stopping hair loss. Though it is likely that other factors contribute to it as well, for instance age and stress, men on Propecia often complain of decreased libido, erectile dysfunction, and/or decreased volume of ejaculate.
Generally sexual dysfunctions start soon after treatment with Propecia has begun, though it is also possible that they occur later. Sexual dysfunctions stop after the treatment is over and sometimes they stop even if the treatment is still going on. In any case, these dysfunctions are reversible, so you shouldn't worry about permanent changes in your sexuality.
Another possible side effect of hair loss treatment with Propecia is breast tenderness or breast enlargement. Again, as with sexual dysfunctions, these complaints pretty often come also from men, who do not take Propecia, so it is not always certain if they are due to Propecia or to other factors. In very rare cases Propecia can cause testicular pain, urticaria, pruritus or swelling of the lips and face.
A positive side effect of Propecia is that it reduces or delays the appearance of prostate cancer (except high-grade prostate cancer, for which Propecia has a slightly negative effect), as well as urinary problems. For older men this is certainly a benefit that far outweighs the potential sexual dysfunctions.
For pregnant women, however, Propecia has many more risks, than for men and women who are not pregnant. Generally Propecia tablets have a protective coating that prevents the absorption of finesteride by the fetus but still there is a risk for a male fetus, if the protective coating of the pill is damaged. Because of this for women, who are pregnant, or who suppose that they might be pregnant, Propecia is generally not recommendable. For post-menopausal women Propecia is not a solution at all (or at least this is what research shows) and there are not known side effects.
In comparison to Propecia, Rogaine has less side effects. Actually, the only serious complaint patients have had when applying Rogaine correctly is itching. Overdosing Rogaine – i.e. applying more of 1 ml. to the scalp twice a day – does not lead to faster hair growth but only intensifies the itching. Besides itching, it is also possible to experience inflammation and redness in the areas where it is applies but if you use oils and lotions, itching, inflammation and redness will most likely disappear.
As for itching, generally it is not unbearable and for most patients anti-dandruff shampoos stop it. However, if even anti-dandruff shampoo does not stop your itching, you may consider stopping Rogaine. In any case, first consult your doctor and see what he or she will recommend you. Also, if you know that you have particular allergies – for instance to dyes, or have a heart disease and/or high blood pressure, tell about it to your doctor and he or she will decide whether this can lead to a risky combination or not.
