Some scholars see that the addition of a small quantity of forbidden foodstuff that went through chemical changes so as not to exist on their own acquiring new description, will not affect food permissibility.
It is forbidden to Muslims to eat any food certainly mixed with what is forbidden like pork. In case of doubt about it then the food is permissible to eat, because the normal ruling is that things are permissible.
Muslims living in a non-Muslim country are often invited to events where people are drinking. This is not permissible but some scholars permit it if a Muslim fears some adverse effect or hope to tell about Islam.
In general it is not permissible to a Muslim to eat in restaurants serving wine or pork. In case there is no other place to eat, it is accepted provided that he does not eat or drink anything that is forbidden.
The Qur’an and the Sunnah, as well as the unanimity of Muslim scholars, make clear that the flesh of swine is forbidden to eat. And it is also not permissible to use extracts from what is forbidden like gelatin or yeast.
Muslims are allowed to take medicine containing alcohol if its amount doesn’t affect the mind and there is no other alternative. It should be prescribed by a qualified doctor and taken within essential limits.
