Also try a Google.com search using the terms "(insert drug name) dientamoeba fragilis dose OR dosing." ("OR" tells Google to look for either word dose or dosing.)
"The tips on the herbs was also very good, I will try it after the medicine to be sure that the parasites are entirely gone."
Thanks. After posting my earlier message, I thought to recommend that you take these herbs AT THE SAME TIME as any prescription drugs (assuming the drug websites such as Mayo Clinic's don't recommend against taking these particular meds at the same time). Usually (but not always), herbs can be taken at the same time as prescription drugs, and the combined effect might possibly be greater than drugs alone, at least in theory.