Question Summary:
Cannot fast due to illness

Question Detail:

Salam
I've got a medical letter from my doctor that saids I cannot fast                       
I have Nephrotic Syndrome - It is treated with steroids that I must take every day.
Also another medication called cyclosporine that I must take twice a day.
If I was to miss a dosage I could potentially relapse which would mean I keep bad protein and swell this is then treated with increased steroid and that can harm my health massively.
In the past the doctors have advised me not to fast but haven’t been too strict about it and my illness wouldn’t become too bad. This year however, the doctors have just recently helped me become stable. Therefore, they are urging me not to fast and are being much more strict about it, so that my illness doesn’t make me unstable and worse again. 
It is possible for me to fast in shorter days but the fasts this year will be 18-19 hours approximately here in the uk.
In this situation, what should I do regarding this years Ramadhan fasts.

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
If you fear that by fasting, your illness will increase, then you may not fast in Ramadhan.[i] However, you will have to perform Qadhaa of your fasts when you are able to do so. [ii]
 
And Allah Ta’āla Knows Best
Ridhwan Ur Rahman
Student Darul Iftaa
Cardiff, Wales, UK 
Checked and Approved by,
Mufti Ebrahim Desai