Not medical Advice: Sources suggest not to take laxatives to get rid of constipation during menstruation.
In this sensitive stage, the next taking diarrhea constipation medicine, although sometimes it is "urgent needs", it will bring or aggravate bloating, abdominal pain, back pain, and other problems.
Most laxatives taste cold, after taking the lead to menstrual blood stagnation, poor, weak uterine contractions, blood, is more difficult to discharge so the blood will become blood clots, uterine discharge for the blood clot, had to increase the intensity of the contraction, causing dysmenorrhea.
As per Ndhealthfacts.org, castor oil is a strong laxative when taken orally. But it should be in small doses, as too much can be a poison.
If you have menstruation, castor oil is effective in the pain and inflammation associated with menstrual disorders. It should be placed over the abdomen for a few minutes. The oil is absorbed into the skin and it stimulates lymphatic circulation.
Please note that it should be used with care during menstruation, as it may create heavier bleeding.
Here are some ways to help relieve constipation during your period shared by Constipationexperts.co.uk.