Testing new medicines on people in return for money
Question

                What is the ruling on a Muslim patient agreeing to have a new medicine tested on him in return for money, knowing that this medicine may have harmful side effects?
Praise be to Allah.We put this question to Shaykh ‘Abd-Allaah ibn
      Jibreen (may Allaah preserve him, who answered as follows:
 If the harm which may result from this trial of
      the new medicine can be treated with permissible (halaaal) medicine and
      its effects can be lessened, whether this treatment is administered by the
      drug company or by others, then it is OK for him to use the new medicine
      in order to test it, whether this is done in return for money or
      voluntarily. But if it is known that the medicine may have irreversible
      harmful side effects which cannot be treated, then it is not permissible
      for him to take it, even if a lot of money is offered in return, because
      Allaah says (interpretation of the meaning): “And do not kill
      yourselves” [al-Nisaa’ 4:29]. And Allaah knows best.