A drug that can cause diarrhea, and its toxicity is relatively small, and it can be bought in pharmacies (some laxatives are limited by prescriptions) for treating constipation, which is called "fruit guide tablets", although its effect is less than that of croton cream of traditional Chinese medicine, and its toxicity is much less; It is basically "colorless and tasteless" after being dissolved in water (if it is tea or beverage, you can't feel the existence of this medicine) (if the medicine is not dissolved, it can be chewed and taken, so it should be tasteless), and taking more than 3 tablets at a time may cause diarrhea.

there is Mgso4 (magnesium sulfate), which is not very harmful to human body.

but I still have to say, we must be careful! This method is not "feasible". If there are consequences, you will bear the relevant responsibilities! Even legal responsibility! So please think twice!