The Impact of Fasting

I have a question regarding a drop in blood pressure: does it affect
fasting? Please give me some details on the issue, and what are the
cases of high blood pressure that could prevent a person from fasting?
Answer:
Assalaamu 'Alaykum ,
Perhaps you meant to ask about the impact fasting has on blood
pressure. Blood pressure should not prevent a person from fasting
unless it is high enough to require medication to maintain its level
and one cannot wait until he breaks his fast to take such medication.
Normally, such high blood pressure (diastolic 140) is accompanied by
the failure of vital organs, like thekidneys, the retina, the heart or
the lungs, and thus one cannot wait until she breaks his fast to
consume the medication. This is also the case when the blood pressure
is very low. However, normal blood pressure does not prevent one from
fasting.
Does being a person with an abnormal blood pressure necessarily mean
that he cannot fast? The answer to this is no, because he can schedule
his medicine to be consumed after she breaks the fast. She can take
all the needed doses from sunset to dawn, before she starts to fast.
However, she must only do so after consulting her physician, because
circumstances differ from one patient to another, and it also depends
on the type of medication one must take. All these matters are usually
stated