Is it permissible to exchange prescribed medication for children or the mother, or cosmetics, for other medications, with a 15% discount on the prescription's value, in the case of private health insurance from which an annual sum is deducted?

If a person acquires medicine through lawful means, they have the right to sell it for money or exchange it for another medicine, whether the medicine is for them or for someone else. The important thing is that the possession of the medicine is lawful.