Ivermectrin will get all parasites both internal and external, except Tape Worms. The injectable is usually used orally in chickens and the drench/pour-on is used externally and there is no need to use both. The drug is circulated through the blood stream so blood-sucking things such as lice and mites are wiped out as well as worms. The Zemectrin Gold will also get tape worms according to the literature included with it and as Guy said just a small tad will do it.
Did ya'll know some wormers are used as cancer drugs?
Did ya'll know some wormers are used as cancer drugs?