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Systemically Acting Drugs that are

Applied Topically and

Not Exempt From the Labeling and Storage

Requirements

The following is a list of FDA approved drugs that are applied as tropical’s for their
systemic effect against internal parasites, cattle grubs, or external insects such as
lice. They are not topical antiseptics or wound dressings and they are not
labeled for use in lactating dairy cattle; therefore, they are not exempt under
Item 15r.

DRUG TRADE NAME EXAMPLES

Fenthion Spotton Cattle Insecticide
Tiguvon Pour On

Famphur and Xylene Purina Grub Kill
Warbex Famphur Pour On

Phosmet Star Bar GX-118
Prolate 1-E

Ivermectins and Avermectins Ivomec Pour On
Doramectin Pour On

Levamisole Tramisol Pour On
Totalon

Because of their potential to cause residues in milk, the use of these drugs on
lactating dairy cattle or their storage with the lactating cattle drugs is a violation of
Item 15r.

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