Fasting al-Ayyaam al-Beed is done according to the lunar calendar, not the solar

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It is difficult for him to fast and he wants to take some medication to reduce his desire
The virtue of fasting ‘Ashoora’

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Related Answers:
Is fasting six days of Shawwaal makrooh, as some scholars say?
Is it better to fast on Mondays and Thursdays or on three days of each month?
He intended to fast ‘Ashoora’, then he did not fast it; how can he make up what he missed out on of reward and virtue?
It is difficult for him to fast and he wants to take some medication to reduce his desire
The virtue of fasting ‘Ashoora’

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