Is it permissible to give certain medications to patients based on a percentage obtained by the pharmacist and the employer, while other alternatives exist, knowing that priority in prescription is given to medications that include a percentage?

It is permissible for a physician or pharmacist to contract with institutions to promote their medicines for a fee. This falls under the category of permissible brokerage, provided that the promotion does not involve deceiving patients or urging them to purchase what they do not need, or what is more expensive when a better and cheaper alternative is available.