Using kohl or putting ear or eye drops doesn’t nullify the fast, according to some scholars of Islam.
Sheikh Yusuf Al-Qaradawi, states: As far as putting kohl on the eyes during the days of Ramadan – or putting medicine in the ears and or having anal injections’ is concerned, all these are things in which some of them might reach the stomach. But they would not reach the stomach by natural means, would not provide nourishment, and would not stimulate people.
The scholars of the past and present have differed regarding this issue. Some scholars judge that these things nullify the fast. Others say that these things do not reach the stomach through natural ways therefore do not nullify the fast.
In fact, I am in favor of the opinion that these things – using kohl, eye drops, ear drops, creams on the buttocks for those who have hemorrhoids, and anal injections (sometimes used for those with constipation) – do not nullify the fast. This is also what Ibn Taymiyyah preferred in his ‘Fatawa’, saying: What has more support is that none of these things nullify the fast because it is something from the religion of Islam in which knowledge of its general and specific aspects are a must. If these things are from that which Allah and His Messenger (peace and blessings be upon him) prohibited during the fast, then this would have been made clear by the Messenger (peace and blessings be upon him). Concerning this, nobody from the people of knowledge have transmitted any hadith whether authentic, weak, etc. The narrated hadith about kohl is weak, and Yahya ibn Mu`een said: ‘This hadith is rejected.’