Prilactone tablets for dogs Presentation Available as three different strengths (10, 40 and 80 mg). Prilactone® 10 mg Tablets for dogs - White, with a slight brownish mottling, bisected oval tablet of 10 mm length, containing spironolactone 10 mg. Prilactone® 40 mg Tablets for dogs - White, with a slight brownish mottling, oval tablet of 17 mm length with three parallel break-lines, containing spironolactone 40 mg. Prilactone® 80 mg Tablets for dogs - White, with a slight brownish mottling, oval tablet of 20 mm length with three parallel break-lines, containing spironolactone 80 mg.