Question:

Due to health reason, my father needs to consume medicine in the form of tablet 3 xs per day. Failing to do so will 'most definitely' (per medical advice) lead to high blood pressure which put his health condition in danger. My question is: can he consume the 2nd tablet while fasting since ideally, it should be taken during lunch time. Currently, he's taking the 1st tablet during Sahoor, 2nd one during Iftaar and the 3rd before sleeping. The concern is on overlapping bet. 2nd and 3rd tablet which caused overdose and lack of medical impact. 

Fatwa:

All perfect praise be to Allah, the Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His Slave and Messenger.

Know that drinking or eating medicine during the day in Ramadan nullifies the fasting.

There are texts that allow a sick person to break his fast and make it up later.

For more details read the Fatwas 86889 and 84196.

Allah Knows best.