Is working as a pharmacist, in the presence of men (some of whom are non-Muslims), and without wearing the niqab, while adhering to modest dress and in a mixed environment (medical complexes that include female nurses and doctors), considered permissible and lawful? Will one be rewarded for helping non-Muslim patients in this work? And does this affect the permissibility of the money earned from it?

The presence of men and women in one place with differentiation is not considered forbidden mixing (ikhtilat). If the work is free from forbidden mixing or impermissible seclusion (khalwa), then there is no harm in it, provided that everything leading to fitna (temptation/discord) is avoided and the face is covered. Money earned from a permissible job is lawful, even if it is accompanied by the commission of forbidden acts like mixing. Being kind to the sick is a great act of closeness to Allah, and this includes Muslims and peaceful disbelievers, based on the Almighty's saying: "Allah does not forbid you from those who do not fight you because of religion and do not expel you from your homes - from being righteous toward them and acting justly toward them. Indeed, Allah loves those who act justly," and based on the Prophet's (peace be upon him) saying: "In every wet liver (living creature), there is a reward."