Question
Reference number: 645732 | Fasting | May 13, 2019
Praise Be to Allah and Peace Be Upon His Messenger. Referring to your question, breathing via oxygen tanks do not invalidate fasting. Scholars agreed upon this.
Answer
Praise Be to Allah and Peace Be Upon His Messenger.
Referring to your question, nasal spray which is used to treat the asthma does not break the fast. This was decided by the Palestinian Legal Verdict Council.
Nasal spry is used by patients who suffer from asthma.
However, using nebulizer seems to invalidate fasting as there are certain liquids that could reach the throat to the oral cavity.