Reading up can help with asking questions, and sometimes getting advice from different sources can be useful. I can think of a couple of incidences where I have been prescribed medication which I shouldn't have been.
Once by a GP, who seemed quite affronted that I was questioning her by saying I couldn't have the drug that she had prescribed (interacted with another consultant prescribed drug) until she looked it up and it confirmed what I was saying.
The second was a Registrar who prescribed a drug for a serious condition (RA) which would have been rendered ineffective by another drug I was taking. I questioned it and it was referred to the hospital pharmacy who confirmed that I was right. They also had not told me about a very significant side effect of the drug, which I was very unhappy about and very relieved that I'd read up before I took any.
It was actually me finding out about that in literature, after being given the drugs, and doing my own reading up which lead to me spotting the issue about the other drug I was taking. I was also angry as the rather expensive drugs then had to be given back to the hospital pharmacy, who couldn't then reuse them.
Both incidences were resolved by me having read up about the drugs and being able to seek advice and answer questions. It is only two examples over a long period though and I have different drugs prescribed by different places, GP and different departments at different hospitals. I just find that it helps to be informed and to ask questions that you need to.
Some things are very specialist. I've had one of my medicines questioned a few times by pharmacists and my GP surgery as it's apparently a much bigger dose than what the "usual" maximum prescribed is. It was prescribed by my consultant and he has now put it in writing to my GP surgery that the dose is fine.
If it's a RA drug (if I remember right you have RA, and with you mentioning the hair loss bit?) then there are a few of us on here who might have some personal experience, though obviously that's personal to everyone and I don't mean instead of taking professional advice. There may be some tips though about managing those kinds of side effects.