Is money spent on prescriptions added into HSA medical costs?

Did the HSA pay for the prescriptions? Then yes. If you paid out of pocket, you will enter the amount on Schedule A.

See Eligible Expenses in this LINK and medicines are explained below.

Medicines, prescribed - Amounts paid for prescribed medicines and drugs are reimbursable. A prescribed drug is one which requires a prescription by a doctor for its use by an individual. The cost of insulin is also reimbursable. The cost of a prescribed drug ordered and shipped from another country cannot be reimbursed. The importation of prescribed drugs by individuals is illegal under federal law (even if allowed by state law). However, you can be reimbursed for the cost of a prescribed drug that you purchased and consumed in another country if the drug is legal in both the other country and the United States. See Over-the-counter medicines and drugs.