Dutastéride (Avodart) is the second generation of the 5-alpha-reductase. The first of the class is Finasteride, which is the same chemical found in Proscar (5mgs / tab) and Propecia (1 mg / tab). The important difference between Finasteride and Dutasteride is that Finasteride only acts on that of the enzyme 5a-reductase, while Avodart works both (hence the name Dutasteride, which is a derivative of Double tasteride ").
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Propecia was the first product of its kind on the market, and was designed to protect humans against the interactions of 5a-R and DHT on the prostate. At a certain point, it has been discovered that this type of product would also help protect men from Androgenetic Alopecia (AGA), or male pattern baldness. This is the most common form of hair loss experienced by men, and it's pathogenesis is thought to be primarily dependent on androgens, however, genetic predisposition is the fundamental requirement of this problem. In addition, the X chromosome (your mother's genes) is the first determinant of this problem. If the men in your maternal family are not bald, then it will not be a problem for you. Possible prostate problems will always be a problem, and Dutasteride (Avodart) will help those that well, with a little more efficiency than you would see with the finasteride, because of its ability to act on both enzymes that affect the prostate.
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Unfortunately, the low levels of 5a-Reductase and the resultant low levels of DHT, have been linked to gynocomastia in some cases. I would not recommend staying on any 5a-R inhibitor for longer than necessary, in most cases. Of course, something to eliminate estrogen like the letrozole, can be used to combat the possible side effects, but then you are really on a slippery slope where you start using a drug to fight the side effect of another, then a third drug to fight the side effects of the second.
My advice is to use the Avodart when you need it, but not all the time.