Covid positive. He should have?

My father tested positive for covid a few days ago and was having these medicines. the day he started the medicines, he also started to face some loose motion, so we thought that this could be due to some medicine and it will stop once the medicines are over. but  it did not stop. now 17 days have passed, medicine courses have been completed, but his loose motion is like that only. his other symptoms( fever, coughing, body and headache, sore throat) everything has subsided... but this loose motion is still the same. he generally has 6-7 or sometimes 8 episodes a day. he has now completely recovered from his covid symptoms except this. will this subside on its own, or does it need any medical assist? if yes, then what medicines he should have?