Bayvarol Strips Pharmaceutical precautions Do not store above 25°C. Store away from food, drink and animal feedingstuffs. Do not open foil bags until immediately prior to use. Once opened the strips should be used and discarded within 6 weeks. Unused product or waste material should be disposed of in accordance with current practice for pharmaceutical waste under national waste disposal regulations. Flumethrin is dangerous to fish; do not contaminate ponds, waterways or ditches with the strips or used packaging.