I suffer from severe allergic rhinitis and have been using nose drops for the past six years to alleviate the severity of my condition. This becomes a problem in Ramadan because I know that nose drops are among the things which invalidate fasting.
However, the problem lies in that if I do not use it, I get severe colds and headaches. Last year while I was studying in a private university, I was forced to use nose drops. I tried to not let the drops reach my throat, but I could feel their taste. I would like to know the ruling of Islamic law on the above and on the status of my fast.
Your fast on that day was invalidated by the drops that reached your throat. You must fast a day in lieu of the one on which your fast was invalidated. The answer is known from the above. Allah the Almighty knows best.
Dar al-Fatwa al-Misriyya