Is working for a pharmaceutical company that pays doctors to market its products unlawful (haram) or lawful (halal), and is the income earned from this work unlawful, especially given the presence of debts and the absence of an alternative source of income?

Working for the company is permissible if it is in a field other than the one for which you are responsible. However, if it is in the field for which you are responsible, refer to Fatwa No. 41984 to clarify the impermissible and permissible types [of work]. If it is impermissible, you must leave the job and engage in permissible areas of the company's work. As for the salary, it is originally permissible unless the contract was for impermissible work or the work became exclusively impermissible. Refer to Fatwa No. 95796.