Goodwinol Vet Rx Cat - 2 oz The same 100% natural proven formula since 1874 is still an effective treatment, providing temporary relief of upper respiratory ailments produced by congestion or allergy. Vet Rx improves respiratory function by stimulating the depth of ventilation and increasing lung ventilation. The aromatic effect of one treatment often lasts several days. It is also effective against ear mites and ear canker. Formulated and packaged for most animals.