question: I am 37 years old, 158 cm, 54 kg female. I tend to get stomach infections easily if i eat out etc. Usually my doc prescribes antibiotics which help in curing this. This time, when I got a stomach infection, along with antibiotics (for 5 days) I was also given Meftal-spas(antispasmodic). On the 3rd day of the dose, I also got my periods. And from the next day I got a lot of pain/spasms in the stomach and scanty periods. Normally my periods are normal and not scanty and I don’t get much pain etc. I somehow feel that Meftal spas caused /interfered with my periods. I vaguely remember a similar thing happened some 4-5 years back wherein I was given something for stomach bug similar to meftal spas but it caused more pain. Unfortunately I do not remember the drug name. But I remember the doc that time mentioning that was the culprit as it was a strong medicine.  Anyway I stopped the last 2 doses of meftal spas and now those pains are gone.  But I just wanted to know if the Meftal spas could have caused the problem.