Grapefruit juice increases the bioavailability of many drugs, even herbs. Some it decreases. I hope I am not mistaking this effect w Alb vs. Prazi.
Generally speaking (in most cases) gfruit juice causes the liver to maintain the drug longer, from what I understand.
Hair loss occurs in often with some people during detoxification of any kind. Not all, but many. Typically women. My suspicion (underscore) is that it is largely a hormonal thing. Could be wrong.
I wouldn't worry about it. Very little hair on men is rather sexy.