Is it permissible to give donated medicines to people who are able to afford them, or must they be unable to afford them? And can the available medicines, including those scarce in the market, be dispensed to people? And what should be done with the money if it is taken in exchange for them?

If the donor specifies that the medicine is for the needy, the agent is not permitted to dispense it to others, whether for a fee or for free, because the agent is a trustee bound by the principal's authorization. If you fear the medicine will spoil due to approaching expiration, the solution is to sell it, and with its price, purchase similar medicine to provide for the needy. It is advisable to communicate with doctors to facilitate access for those in need.