Doctor might have used the initials of the medicine's name,
According to initial mention in the prescription
P.N - Pulsatilla Nig.
B.S - Bismuthum
A.A - Arsenic Album
A.Sulp - Arsenic Sulph.
I write these names, according to the initials of the medicine and verified your case or complaints written on prescription.
But I can be wrong.
So you must confirm your doctor about these medicines
Health Tips
I have a point which i think every patient and doctor should understand
Every individual has his/her right to select what treatment he/she want to go for and he/she also posses the right of knowledge that what treatment or medicine he/she is taking. I know in the case of homoeopathy it's not favourable every time, because one homoeopathy medicine covers many symptoms and can be prescribed in different clinical conditions and of course this information is not completely available on google blogs so patients might get confused after reading on the internet that they are taking a medicine which actually is not for the clinical conditions which he/she be suffering.
So, as a patient have some faith in your doctor and maintain a transparency with them to communicate better.