Hi,
Melatonin is a natural hormone that is used in the treatment of insomnia,
depression,
chronic pain, dementia and many more. But it is a safe medication for short term use, because this medication has some side effects of its own. Melatonin can cause abnormal sensation of defecation, nausea, vomiting, dizziness, diarrhea,
abdominal pain, spasms, abdominal distension,
drowsiness, loss of appetite, headache and other symptoms as its side effects. These side effects are mild and usually go away over time. But any of these side effects persist or bother you then you should consult your prescribing doctor promptly for
medical help.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Zubayer Alam, General And Family Physician