Understanding the shelf life of ivermectin is crucial for ensuring the medication remains safe and effective for treating parasitic infections. Whether you are using ivermectin pills for humans, liquid injectables, or horse paste for animals, improper storage can quickly degrade the active ingredients. This guide covers everything you need to know about ivermectin storage requirements, expiration dates, and whether it is safe to use past its prime.
Page Contents
- Ivermectin Storage: Should You Refrigerate Ivermectin?
- How Long Does Ivermectin Last After the Expiration Date?
- FAQ: Frequently Asked Questions
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Quick Answer: Does Ivermectin Ever Go Bad?
Yes, ivermectin does go bad. While it won’t instantly become toxic the day after its expiration date, its potency significantly decreases over time, making it ineffective against parasites. Most unopened ivermectin formulations have a shelf life of 2 to 3 years from the date of manufacture. Once opened, liquid ivermectin and pastes can expire much faster due to exposure to air and potential bacterial contamination. For optimal shelf life, store ivermectin at room temperature, away from direct sunlight and extreme heat.
Ivermectin Storage: Should You Refrigerate Ivermectin?
One of the most common questions is, “Does ivermectin have to be refrigerated?” Generally, the answer is no. Most forms of ivermectin—including pills, paste, and liquid injectables—are designed to be stored at a controlled room temperature, typically between 59°F and 86°F (15°C to 30°C). In fact, refrigerating certain ivermectin liquids can cause the solution to thicken or crystallize, making it difficult to draw into a syringe.
Best Storage Practices
- Avoid Heat: Does heat degrade ivermectin? Yes, leaving it in a hot barn or car will rapidly destroy the active ingredient.
- Block Sunlight: Store it in its original carton to protect it from UV light degradation.
- Keep it Sealed: Ensure caps on paste syringes and liquid bottles are tightly secured.
How Long Does Ivermectin Last After the Expiration Date?
Many people wonder if they can use expired ivermectin, especially when treating livestock like horses or donkeys. While ivermectin paste might remain potent for a few months past its printed date if stored perfectly, veterinarians strongly advise against using it. Using expired ivermectin can lead to under-dosing. When parasites are exposed to a weak dose, it doesn’t kill them; instead, it accelerates parasite resistance on your farm, which is a massive agricultural problem.
If you have liquid ivermectin that is 2 years expired, or if you ask, “Can I use liquid ivermectin after 12 years?”, the answer is an absolute no. The drug will be completely ineffective and potentially contaminated. Once the seal is broken on liquid injectable bottles, you should generally discard any unused portion within 28 days to 6 months, depending on the manufacturer’s specific instructions.
FAQ: Frequently Asked Questions
Does liquid ivermectin have to be refrigerated?
No, standard liquid ivermectin does not need to be refrigerated. Store it at room temperature. Refrigeration can alter the viscosity of the liquid, making it difficult to inject.
Does ivermectin horse paste expire?
Yes, horse paste absolutely expires. The expiration date is typically printed on the plunger or the box. Expired paste loses potency and can contribute to parasite resistance if used.
Can I use expired ivermectin in donkeys?
It is not recommended. Just like in horses, using expired, weakened ivermectin on donkeys may fail to clear the parasite load and breed resistant worms.
What happens if Ivermectin is expired and a person takes some?
Taking expired human-grade ivermectin pills is unlikely to be toxic, but they will not be effective at treating the infection. Never take animal-grade paste or injectables, expired or not, as they are not formulated for human safety.
