Should the value of goods sold on credit be deducted from the total value of the pharmacy's inventory when calculating zakat, or should only the value of goods in the warehouse be deducted?

The zakat on a pharmacy is like the zakat on trade goods. The value of the medicines is calculated at market price after one year has passed on the money used to purchase the pharmacy. To this, cash, trade goods, and anticipated debts are added. Zakat is not obligatory on fixed assets not intended for sale, such as furniture and equipment. Debts owed by you are deducted from the zakatable wealth, unless you have non-zakatable or non-essential funds that can cover the debt. As for your share in the medical warehouse, there is no zakat on it as long as the management handles its zakat.