About chemotherapy drugs, how can we reduce the diarrhea<side_effect> caused by them!? Is it safe to use lupramide for these patients, oe not?

Chemo and diarrhea. Some chemo can cause diarrhea or other GI problems. You need to make sure you hydrate yourself well- fluids-fluids-fluids. Gatorade or pedialite would be good. If you think about antidiarrhea- you need to make sure that it is not infectious diarrhea- no bloody stool, no mucuous, no fever. Discuss with your oncologist in detail. If diarrhea continues for 2 days or so, you may need IV fluids +/- abx.
Maybe. Some chemotherapy drugs are more prone to diarrhea then others (eg, irinotecan, docetaxel). Be careful with anti-diarrheal medications to make sure the diarrhea isn't infection, such as clostridium difficile colitis (c.Diff). Clinical trials looking at reducing diarrhea toxins -- eg irinotecan & casad- calcium aluminosilicate anti-diarrhea (basically a refined mud).
If doc says it is OK. As others have stated, it is essential to know why someone is having diarrhea before treating. Loperamide is commonly used for irinotecan-induced diarrhea, but it should never be used if there are concerns that an infection could be a cause. This can sometimes be difficult to figure out. Always talk with your oncologist.