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Hello, this is Dr. Jess. You can get a product equivilant to karasolv at most pharmacies such as Walgreens in the foot care department (where they sell things like insoles and foot creams). It is called Kerasal exfoliating foot ointment, and has the same active ingredients, and I have used it as a replacement when Karasolv became difficult to come by. You can see it at http://www.walgreens.com/store/c/kerasal-exfoliating-moisturizer-foot-ointment/ID=prod1182034-product
The Duoxo Seborrhea spot I haven't used before, and don't know of anything in your local store that is equivilant. You could call your vet's office to see if they carry it, or order it from Amazon.com.