During Covid when veterinary clinics were closed, Megestrol Acetate was used as a short-term delay contraception solution in cats.  For the efficiency pros and cons of this product, visit    AlleyCat Megestrol on the AlleyCat Allies website.  Please also view work done on mice non-hormonal contraception, which may one day be used in strays.  Mice contraception  Each discovery will bring us one step closer to our goal of nonsurgical low-cost, easy-to-use contraception for strays. See Michelson Prize Research Summary