If you mean scours/diarrhea I was using Kao-Pec Anti-Diarrheal Medications
That's a start. There's three groups of medicines you need to combat scours.
1) Electrolytes/Probiotics -- very important. An electrolyte imbalance can kill a calf as fast as anything, and good bacteria need to be replenished with probiotics to help stop the scours.
2) Antibiotics -- to fight bacterial infections that cause scours. Look for brand names like LA200 (aka Biomycin, Agrimycin, etc), Nuflor, Spectam, Penicillin, etc.
3) Anti-diarrheal solutions such as Kao-Pec, Bismu-Kote, activated charcoal, etc. Works to soothe the inflamed gut and absorb toxins produced by the bacteria.
Next, there's three main ways a calf can die due to scours.
1) Dehydration -- you MUST keep them hydrated, by tubing or IVing if neccessary. Dehydration does not become evident until a calf has lost 6% of its body weight in fluids.
2) Electrolyte imbalance as mentioned before -- scours cause an animal to go into a state of acidosis, in which case they need sodium bicarbonate to counteract it. They also need dextrose to keep the blood sugar levels up, as well as sodium chloride (salt). Look for an electrolyte mix at your local feed store that contains sodium bicarb, sodium chloride, and dextrose.
3) Toxins -- toxins produced by the bacteria can also kill the calf, which is the reason for using something like KaoPec or activated charcoal.
Hope that gives you something to work with... and hope your calves start doing better!