Propecia, also known as Finasteride, is a medication used to treat conditions related to the male reproductive system. It is commonly used to treat male pattern baldness and an enlarged prostate. The two most common dosages of Propecia are 5mg and 1mg. The main difference between these two doses is the concentration of Finasteride in each tablet. A 5mg tablet contains 5 milligrams of Finasteride, while a 1mg tablet contains 1 milligram of Finasteride. This means that a 1mg tablet will have half the amount of active ingredient as a 5mg tablet. Both doses are effective in treating their respective conditions, but the 5mg dose is typically more effective for treating male pattern baldness, while the 1mg dose is more commonly used to treat an enlarged prostate. It's important to consult with a doctor before starting any new medication, including Propecia, to determine the best course of treatment and dosage for your individual needs. It is also important to note that both 5mg and 1mg tablets are only available with a prescription from a doctor. It is illegal to buy these medications without one. And it's always recommended to follow the instructions provided by your doctor and take the medicine as directed.