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Question:

Did I ruin my cat's medicine?

I’m completely freaking out right now and really need some advice. My cat, Milo, was prescribed this liquid medication for a minor infection, and everything was going fine until today. I didn't realize it at first, but I accidentally left the bottle on the windowsill where the sun was beating down all afternoon. When I went to give Milo his dose tonight, I noticed the liquid looked a bit different—almost like it had separated or something. I’m so worried that the medicine might have gone bad and could harm him if I give it to him in this state. Can the sunlight really ruin his meds? I can't get a hold of my vet tonight, and I don't want to skip a dose if it might be okay too. I’m feeling like the worst pet parent ever! Does anyone have any experience with this or advice on what I should do next?

Answer:

Thanks for reaching out with your concern! It's great that you're being proactive about your cat's health.



If you’re worried about accidentally compromising your cat's medication, let's look at some common situations. Medications can lose their effectiveness if exposed to heat, moisture, or direct sunlight. Double-check where you store the medicine—ideally, it should be in a cool, dry place. If pills got wet or liquids changed color, or consistency, they may need replacement.



At home, you can manage by ensuring your cat gets their meds on schedule in a safe manner. Monitor for any signs of your cat's condition worsening, like changes in appetite, behavior, or energy levels. Keep an eye out for any unusual symptoms like vomiting, diarrhea, or excessive lethargy, as these could suggest the medication isn’t working correctly.



If they do experience any of these signs or if you're still concerned about the effectiveness of the medicine, it's best to consult with a vet. This can help determine if your cat needs a check-up or a replacement medication to ensure they stay happy and healthy.



Booking a video consult with Dial A Vet allows you to get expert advice from the comfort of your home. We're here to help whenever you need!

Answered by

Louise - Senior Veterinary Nurse, Dial A Vet

June 24, 2025

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The "Ask a Vet" forum on Dial A Vet offers general information and helpful tips on pet health, but it's not a substitute for professional veterinary care. The advice here doesn't create a veterinarian-client-patient relationship, and our vets can't diagnose or treat your pet remotely. For emergencies or specific medical concerns, always contact your local veterinarian immediately. Your pet's health is unique, and decisions should only be made after consulting with a qualified professional. By using this forum, you acknowledge these limitations and agree to seek in-person veterinary advice for all your pet's health needs. View our content guidelines.
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