Fasting for Those Taking Medication - "Lithium"
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Question
A person taking a psychiatric medication called "Lithium" (Licarbium), whose instructions require drinking water. Is there an issue with fasting on the 17th of Tammuz, which is only half a day, if with proper preparation the body seemingly has enough fluid reserves, or not? And what is the ruling regarding Tisha B'Av?
Answer
Hello,
It is advisable to consult a doctor regarding the effects of fasting on the medication's efficacy.
As far as I know, lack of food and drink can cause irregular activity of the medication, and since it is an essential medication, one should not fast on either the 17th of Tammuz or Tisha B'Av.
Source
Mishna Berura, Siman 550, Se'if Katan 4, Shulchan Aruch, Siman 554, Se'if 6.