It depends on the airline... some will allow you to take them, as long as it is approved/monitored by their medical team. Airlines in the Middle East will not allow them at all. This information may also be covered in your crew manual, might be worth checking.

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Yes, it is definitely allowed. You can take eyes drops, saline drops and throat sprays on the flight. It's considered a liquid and falls under the liquid limits for carry-on baggage. I know that Emirates has a medical department that has to approve medical equipment to be allowed onboard. Other airlines may also have this type of department that you would need to contact. Additionally, I would reach out to any airline that you may be traveling with in the future for their policy on this, as most of the information will be covered in their crew manual. Please let me know if you have any other questions or concerns. I have experienced this many times while flying for my official trip from cheap essay help.