Intro
MIrza Ghulam Ahmad and his team of writers contradicted themselves all of the time.  Opium use was rampant in the house of Mirza Ghulam Ahmad.  He even gave out opium-laden drugs to many patients.  In the following reference, Mirza Ghulam Ahmad’s brother-in-law tells us how MGA even used small amounts of poison in his quack medicines.  Further, Mirza Ghulam Ahmad’s grandfather seemed to be of the opinion that wine even for medicine was a bad thing.

The reference
“”Dr Mir Muhammad Ismail stated to me that once Hazrat Masih Maoud formulated a tablet for the treatment of patient of TB, (tuberculosis). Beside quinine, camphor, opium, and hemp, he added some poisonous substances like Dhatoora, in it. He used to say that for the sake of life, life saving and use as a medicine, prohibited goods are allowed too. This humble self says that Hazrat sb has issued similar FATWA (religious decree) for wine. If a doctor or Tabib prescribe them. Then on this occasion hazrat sb told that his great grand father when at death bed was offered Wine by his Tabib but he refused by saying that he would die but would not taste wine””
(Seeratul Mahdi Vol III ,page 615).

The scan work