Be informed...or else

Last week I had gone to see a dermatologist..off lately I have been experiencing a huge hairfall and was concern. She is an expensive doc so I thought twice before I made my mind to visit. I told her very clearly that I have had a cesarean and my baby is only 5 months old.
"Disinterested" was written all over her face.
She listened to me as she had no other option.
After I had told my story, she simply started writing prescription without asking anything else apart from what I told her.
She took 1.5 minutes to finish this task. This is what she prescribed

1) 1 semi liquid medicine to be applied on scalp.
2) 1 multivitamin for the morning
3) 1 Iron tablet to be had in the evening after meals.

She almost read to me what was written on the sheet and advised me to revisit after a month.

Now when I went to chemist to buy those medicines, I was shocked to find that the first solution would cost me around Rs 1100 and the other two brands medicines will cost me around 500 for a 10 days dose.

Anyway cos I was really worried so I bought those and came home happily though a little sad at the little hole in the pocket.

I have a thing for reading the pamphlets of all the medicines before consuming the. I do this purely for the sake of curiosity and nothing else.

When I read the pamphlet, I was shocked to read the following lines.
" Strictly advised not to be taken during pregnancy and breastfeeding."
" Not to be taken if you do not have a family history of baldness"

I was angry and sad. I have a 5 month old baby, does that not mean I am breastfeeding my child. Should the doctor not have asked me?
Why has she not enquired me about my family history of baldness?

If I had not read the pamphlet, I would have probably fed poison to my baby through my milk. I want to sue that doctor, not sure of the right procedure to do it.