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The exact mechanism for ROGAINE® minoxidil products is uncertain, however researchers believe that ROGAINE® minoxidil products work in part by enlarging the hair follicles and reversing the "miniaturization" process. This miniaturization of the hair follicles is a characteristic of hereditary hair loss and can be impacted by hereditary, hormonal and age factors.

By enlarging the miniaturized follicles, the growth phase of the hair cycle is prolonged, allowing the hair to become longer and thicker looking. And with more follicles in the growth phase at the same time, your hair coverage will start to look thicker, too.

It may take at least 4 months for results to be seen, and your results and success may depend on the proper application and dosage.

There are a few signs to look for that let you know ROGAINE® minoxidil products are working. During the first few weeks of use you may see a temporary increase in hair shedding. This is a good sign and means that the new growth cycle is beginning, and the lost hairs are making way for the new, healthy ones.

Eventually, new growth will appear. The earliest hair growth you see may be soft and downy, but continued treatment will produce new hair with the same consistency as the other hair on your scalp.

Remember, not everyone responds to ROGAINE® minoxidil products and individual results will vary. If hair loss continues after 2 weeks or if you do not see any results after 4 months, speak with your doctor.

Continued use of ROGAINE® minoxidil products is needed to maintain hair regrowth. While our clinical studies did not go beyond 48 weeks, there is no limit on how long you may use ROGAINE® minoxidil products.

If you stop using it, the normal hair loss process will start again. You will probably lose your newly regrown hair within 3 to 4 months and will look the way you looked before using ROGAINE® minoxidil products, so you'll want to make ROGAINE® products part of your daily routine.

If you miss 1 or 2 doses of a ROGAINE® minoxidil product, however, just continue with your next regular dose. We do not recommend that you try to make up for missed doses, and 1 or 2 days of not using a ROGAINE® minoxidil product will not affect your long-term hair regrowth as long as you resume regular use.

To our knowledge, there are currently no known drug interactions associated with medications taken by mouth and the use of ROGAINE® minoxidil products. You should not use ROGAINE® minoxidil products if you are using other topical medicines on the scalp.

Ask a doctor before use if you have heart disease.

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If you have a medical emergency or if you need specific medical advice, you should contact your primary healthcare provider, poison control center, or your local emergency room.