It is easy to make if you have the know how and some equipment, also if it is already known what you need to make. For example, aspirin is known structurally (unless I am mistaken), so if you have the chemistry know-how and equipment, you can make your own.
However the tricky part is to get it as a safe medicine to take, that you do not have impurities that could be dangerous, toxic. You will need to be able to make quality and safety checks like that. Which I am not sure how easy that really is.
It is easy to make if you have the know how and some equipment, also if it is already known what you need to make. For example, aspirin is known structurally (unless I am mistaken), so if you have the chemistry know-how and equipment, you can make your own.
However the tricky part is to get it as a safe medicine to take, that you do not have impurities that could be dangerous, toxic. You will need to be able to make quality and safety checks like that. Which I am not sure how easy that really is.