In The Name of Allaah, The Most Merciful, The Bestower of Mercy
The Muslim doctor should not make the patient a means to experimenting the effectiveness of a medication, especially if he fears that there would be great side effects. That is because this experimentation would negate the honour Allaah has bestowed on the children of Aadam. Allaah [The Most High] said:
وَلَقَدۡ كَرَّمۡنَا بَنِىٓ ءَادَمَ وَحَمَلۡنَـٰهُمۡ فِى ٱلۡبَرِّ وَٱلۡبَحۡرِ وَرَزَقۡنَـٰهُم مِّنَ ٱلطَّيِّبَـٰتِ وَفَضَّلۡنَـٰهُمۡ عَلَىٰ ڪَثِيرٍ۬ مِّمَّنۡ خَلَقۡنَا تَفۡضِيلاً۬
And indeed We have honoured the Children of Adam, and We have carried them on land and sea, and have provided them with At-Taiyibat(lawful good things), and have preferred them above many of those whom We have created with a marked preference. [Surah Al-Is’raa Aayah 70]
This deed [i.e. using the patient as a means to experimenting the effectiveness of a medication] negates the command [given to person to] safeguard the blood of a Muslim. The Prophet [sallal-laahu-alayhi-wasallam] said: A Muslim is the brother of another Muslim, so he should not oppress him, nor should he hand him over to an oppressor. Whoever fulfilled the needs of his brother, Allaah will fulfil his needs; whoever brought his [Muslim] brother out of discomfort, Allaah will bring him out of a discomfort from the discomforts of the Day of Resurrection, and whoever screened a Muslim, Allaah will screen him on the Day of Resurrection. [Bukhaari Hadeeth Number 2442]
If the Muslim doctor is certain that the harm [or side effects] that will result from the medication is lesser than the harm caused by the continuation of the illness, then it is permissible to give the medication based on choosing the lesser harm between two.
Source: Akhlaaq at-Tabeeb Al-Muslim’ pages 13 – 14. By Shaikh Muhammad Baazmool [hafidhahullaah]. slightly paraphrased
To be continued…InShaaAllaah