Is it permissible to work as a sales manager in a company that produces contraceptive pills?
Question

                I work in a pharmaceutical company as a sales manager. This company produces contraceptive pills. I distribute this product to doctors (Muslims and non-Muslims). Is my income from this company halaal? If it is not, what should I do? Should I leave my job? Or can I continue with this company until I find other work? Please note that my older brother is unemployed and my two younger brothers are studying, and I am living with my father and mother.
Praise be to Allah.
      Means of contraception, including pills, may be used in a 
      permissible manner, in cases in which it is used to delay pregnancy or 
      prevent it for some reason, or they may be used in a haraam manner, as 
      immoral people do. 

    The basic principle with regard to that which can be used for 
    both halaal and haraam purposes, is that everything that it is thought most 
    likely will be used for haraam purposes, it is not permissible to buy or 
    sell it, because that comes under the heading of cooperating in sin and 
    transgression. 

    Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) 
    said: 

    If it seems most likely that garments will be used to help 
    commit sin, it is not permissible to sell them or sew them for one who will 
    use them for sinful and wrongful purposes. Hence it is makrooh to sell bread 
    and meat to one who you know will drink wine with them, or to sell herbs to 
    one who it is known will use them for wine and so on. The same applies to 
    anything that is basically permissible, if you know that it will be used to 
    help commit sin. This varies from one place, time and situation to another. 
    End quote. 

    Sharh al-‘Umdah, 4/386-387 

    In Fataawa al-Lajnah al-Daa’imah (13/109) it says: 
    Everything that may be used in a haraam way, or it is thought most likely 
    that that is the case, it is haraam to manufacture it, import it, sell it or 
    distribute it among the Muslims. End quote. 

    Based on that, you should act on what you think is most 
    likely the case with regard to those who use these pills, or whether the 
    majority of those who use them, use them for halaal or haraam purposes. If 
    the majority use them for haraam purposes, it is not permissible to sell 
    them; if the majority use them for halaal purposes, there is nothing wrong 
    with selling them. 

    You should remember that whoever gives up something for the 
    sake of Allah, Allah will compensate him with something better than it. 
    Allah says (interpretation of the meaning): 

    “And whosoever fears Allaah and keeps his duty to Him, He 
    will make a way for him to get out (from every difficulty).

    3. And He will provide him from (sources) he never could 
    imagine. And whosoever puts his trust in Allaah, then He will suffice him. 
    Verily, Allaah will accomplish his purpose. Indeed Allaah has set a measure 
    for all things”

    [al-Talaaq 65:2-3]

    “and whosoever fears Allaah and keeps his duty to Him, He 
    will make his matter easy for him”

    [al-Talaaq 65:4]

    Every time you think there is no way out, remember what Allah 
    says (interpretation of the meaning):

    “Allaah will grant after hardship, ease”

    [al-Talaaq 65:7]. 

    We ask Allah to give you sufficient from what He has 
    permitted so that you will have no need of that which He has forbidden. 

    And Allah knows best.