Accutane and Hair Loss

What you heard was correct... it is possible to have a slight degree of hair loss when taking Accutane. However:

This does not usually happen unless the dose goes really high
When it does happen, it's usually not loss of hair in patches or over the entire scalp, but only slight thinning
When the medication is stopped, hair growth usually returns to normal

What occurs more often than hair thinning or mild loss is dryness of the skin, lips, eyes, and nose. This is an expected side effect, but one that can be managed. Don't let the fear of hair loss stop you from Accutane if you need it for scarring acne.
Be well,
Dr. P

Hair loss is not a common side side effect of Accutane, but can happen. Usually if you're experiencing hair loss from Accutane its because you're taking a high dose, but it shouldn't be a problem once you stop taking the medication. 

Hair shedding (also called telogen effluvium) can sometimes occur from the drugs you mentioned - Accutane and Roaccutane.  There is no way to predict if you will experience hair loss from these drugs or not.In most patients (but certainly not all) the hair returns to the same density after the drug is stopped.  Any cause of telogen effluvium (crash diets, thyroid problems, low iron, other drugs) can speed up the development of androgenetic alopecia in those so predisposed.... and sometimes this phenomenon is seen with accutane and other similar retinoids. More studies are needed to determine how frequently that occurs.