What is the ruling on selling stomach medications that are currently used for abortion, and is it permissible for a pharmacist to sell them to patients while knowing they are being used for abortion, even though some doctors prescribe them?

There is no harm in selling medicines that are used for a permissible purpose, even if there is a possibility they might be used for a forbidden purpose, unless it is known or highly probable that the buyer intends to use them for a forbidden purpose. Based on this, it is not permissible to sell medicine to someone who is known to want it for abortion, unless there is a medical document necessitating its dispensation due to an urgent need.