Is it permissible to work in a pharmacy that administers injections to men and women, and sells drugs that are used as narcotics, and are there any prohibited drugs?

It is permissible to inject men with needles, but it is forbidden to inject women unless there is no woman available to do so, due to the exposure of the awrah. It is not permissible to sell medicines that are used as narcotics, nor to work in a pharmacy that sells forbidden items, such as those that contain pork in their composition, unless it is possible to limit one's work to permissible items and refrain from forbidden ones.