NO MORE KITTEN SEASON.ORG

The drug MEGESTROL ACETATE (MA) is a safe, effective contraceptive for cats. 

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This was established by two early studies in the veterinary journals (Oen, 1977 and Houdeshell & Hennessey, 1977).

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It is in regular use by a few knowledgeable vets and by colony keepers who don't have a vet prescription for it, so they order it from Europe, where it is in more common use and can be purchased without a prescription. They have found that a mini-dose of 

​0.5 mg/week is enough to prevent fertility in female cats, of different sizes and different ages. It does not harm the other cats in the colony, who also eat this mini-dose in their food, once or twice a week, until the whole group of cats has been fixed and vaccinated.

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The drug has been helping humans since the 1950's, as a part of certain cancer treatments and to stimulate appetite in AIDS and cancer patients.

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It was approved by the FDA in 1974, as a contraceptive called Ovaban, for dogs.

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It's available worldwide, under different brand names, including: Nonovulin, Ovaban, Ovarid, Megecat, Kontrik, MegAce, Singestar, Canipil, Estropil, Felipil, Megepil chat, Nonoestron, Pilucalm and Pillkan.

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It's available at local and online pharmacies, as the generic "MEGESTROL ACETATE, at only pennies per dose (after proper dilution) for tiny cat doses.

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MEGESTROL ACETATE stops the normal function of the egg part of a female cat's reproductive cycle.​