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For what condition were you given prednisolone? Please mention your age and sex, medical history.
Enema and laxative do cause loose motions. But the effects is short lived.
Take more fluids, small meals for now.
For chronic constipation
you can try homeopathy
Also see a physician, and do sometest like abdominal ultrasonography
, thyroid function tests
, and ESR, to find what is causing all these symptoms.