Slentrol 5 mg/ml oral solution for dogs Pharmaceutical precautions No special precautions for storage. Slentrol is light sensitive so the product should be stored in the original container. Shelf-life after first opening the container: 3 months. Any unused veterinary medicinal product or waste materials derived from such veterinary medicinal product should be disposed of in accordance with local requirements. Keep out of the reach and sight of children. For animal treatment only.