Made by percolation with ether, distillation and evaporation of the
ether.
DOSE.--Horses and cattle, 3 to 6 drs.; sheep and pigs, 1 to 2 drs.; dogs
and cats, 15 ms. to 1 dr.
ACTION AND USES.--Male fern is irritant, vermicide laxative, large doses
of the drug cause hemorrhagic gastro-enteritis, tremors, weakness,
stupor, coma, acute nephritis and cystitis. Oleoresin of male fern is
one of the most effectual remedies for tapeworm, particularly those
inhabiting dogs.