Is it permissible to draw an analogy with eating and drinking out of forgetfulness in the case of using nasal drops while fasting, when their taste is present, remembered, and an attempt is made to expel them?

Nasal drops invalidate the fast if their effect reaches the stomach, because the nose is a recognized opening. This is supported by the prohibition of excessive sniffing (istinjash) for a fasting person. However, if one uses them forgetfully while fasting, their fast is valid by analogy with eating and drinking out of forgetfulness. As for someone who needs them for treatment during an obligatory fast, they are considered ill and are permitted to break their fast. But for one who does not need them during an obligatory fast, it is not permissible to take them. As for one observing a voluntary fast, "he is the master of himself"; if he wishes, he may complete it, and if he wishes, he may break it.