Do not take Biltricide: if allergic to praziquantel or any of the other ingredients of this medicine (listed in Description); if eyes are infected with larvae from the pork tapeworm (intraocular cysticercosis); if also using rifampicin (an active substance for tuberculosis), since rifampicin can increase the activity of enzymes that break down medicines and, as a result, effective blood concentrations of Biltricide may not be reached (see Interactions).