Allopurinol Shelf Life Related Topics
Please remember: to find more related pages that are relevant to you, it's usually faster to search for your biggest allopurinol shelf life concern.
This topic is mostly about allopurinol shelf life. But, as with many forum topics, it includes other aspects of gout. Some of which are also covered by other pages. Often, gout questions can be interpreted in different ways. So here are three pages related to the life of allopurinol.
How fast does allopurinol work?
Maybe people asking how fast allopurinol works are confusing it with gout pain relief. But allopurinol has no pain relief properties. So you need a gout pain control package in place before you let allopurinol into your life. See Gout Progression Phase 3: Gout Pain Relief.
Allopurinol how long does it take to work?
Some people realize that allopurinol reduces the level of uric acid in their blood. So perhaps this question means how soon after taking a dose of allopurinol does it start to reduce uric acid? This is the type of question we consider when we discuss the time for follow-up testing after our first allopurinol dose. Covered in Gout Progression Phase 5: Start Uric Acid Cure. Or after subsequent dose adjustments. Covered in Gout Progression Phase 6: Adjust Uric Acid Cure.
How long before allopurinol works?
But maybe the question means how long before allopurinol works to prevent any more gout flares? Which is when we can say our gout is cured. But we still keep allopurinol in our lives. During the final phase of Gout Progression: Maintain Uric Acid Cure.
🕖Latest Change: December 30, 2022 – ⎙Published:September 15, 2011.
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Hi guys it's been a while since i've been on here. I'm in between doctors right now and i've ran out of my currant script of Allo.??I found a bottle thats a couple of years old. It says discards after 09. Now i'm wondering if this will still be good. The last thing?I need is an attack what do you guys think. Is it worth the risk?
I?have more on the way but its mail order. So?I won't get it for a few days. I've been taking Allo every day for 18 months till my insurance ran out. And?I still haven't ran out?I was asking a simple question. Rather the old stuff would still be good to take till my order gets here??
I've seen where Zip has said he taken Colchicine that was over 10 years old. Thanks for the help 🙂The US Government has made a broad law that (unless specifically designed) no pill medication can have a shelf life longer than 36…..well, to be honest, they mandated that any medication that will be advertised as having a longer shelflife will need to provide a whole slate of additional documentation to the FDA in support of that claim. So the drug companies said screw it and now all medications have a expiriation of 36 months or less.
Your Pharmacy does not know exactly when each bottle of medication was manufactured or how long it sat in a warehouse before being shipped to them so they made a general rule that all medications expire about a year after the order is filled. Liquid meds have an even shorter life.
Thousands of tons of medications expire every year and are still completely effective. They are usually shipped to areas such as Africa where people could care less about some arbitrary date set by a government.
Assuming the botttle has not be subjected to moisture, high heat or direct sunlight for long periods of time, most pill medications last five years or more without a problem. If the pill is still firm and looks ok and smells ok, it is still probably good.
Worst case is that it begins to lose effectiveness as it ages. The half-life of most kinds of antibiotics is approximately 7 years. Meaning at 7 years you would need a double dose. I dont know the numbers for Allopurinol.
So, to answer your question. Yes, go ahead and take the older pills if they feel, look and smell ok. Take your normal dose. If it is slightly less effective…its better than taking nothing. Do not try to raise your dosage to compensate though because you dont know how much effectiveness it has lost and the danger of taking too much is worse than taking less than normal.
Tavery said:
The US Government has made a broad law that (unless specifically designed) no pill medication can have a shelf life longer than 36…..well, to be honest, they mandated that any medication that will be advertised as having a longer shelflife will need to provide a whole slate of additional documentation to the FDA in support of that claim. So the drug companies said screw it and now all medications have a expiriation of 36 months or less.
Your Pharmacy does not know exactly when each bottle of medication was manufactured or how long it sat in a warehouse before being shipped to them so they made a general rule that all medications expire about a year after the order is filled. Liquid meds have an even shorter life.
Thousands of tons of medications expire every year and are still completely effective. They are usually shipped to areas such as Africa where people could care less about some arbitrary date set by a government.
Assuming the botttle has not be subjected to moisture, high heat or direct sunlight for long periods of time, most pill medications last five years or more without a problem. If the pill is still firm and looks ok and smells ok, it is still probably good.
Worst case is that it begins to lose effectiveness as it ages. The half-life of most kinds of antibiotics is approximately 7 years. Meaning at 7 years you would need a double dose. I dont know the numbers for Allopurinol.
So, to answer your question. Yes, go ahead and take the older pills if they feel, look and smell ok. Take your normal dose. If it is slightly less effective…its better than taking nothing. Do not try to raise your dosage to compensate though because you dont know how much effectiveness it has lost and the danger of taking too much is worse than taking less than normal.
Thanks for the info. Thats what?I was looking for.
Shelf Life of Allopurinol
I got a related question recently on my gout help desk. When someone asked about the allopurinol expiration date. So that caused me to revisit this topic.
I’m preparing a full review. But for now, some facts are:
- Half-life is actually “elimination half-life”. That is, the time it takes for drugs to be excreted from the body to half the maximum concentration. It’s really a separate issue. So it’s best to start a new topic. Or ask in the help desk. But the main issue is that allopurinol quickly changes to oxypurinol. That is the important uric acid inhibitor. Studies indicate that the half-life of oxypurinol is 23 hours on average[1]. With a range wider than 17 to 39 hours. So missing a day is not as serious with allopurinol as with some drugs. Note that you must confirm this with your doctor. Because your situation might be different – especially with kidney problems.
- I can only find 1 study related to the shelf life of allopurinol[2]. But it relates to allopurinol tablets crushed into a liquid. So not a definitive answer. But it found “The shelf-life (t90) of the suspension was found to be 8.3 years at room temperature”. Note that shelf life is measured as the time it takes for allopurinol to degrade to 90% of its original concentration.
I would like my review of the shelf life of allopurinol to be as comprehensive as possible. So please share your questions, experiences, and opinions in the Gout Forum.
Allopurinol Shelf Life References
- Day, Richard O., Garry G. Graham, Mark Hicks, Andrew J. McLachlan, Sophie L. Stocker, and Kenneth M. Williams. “Clinical pharmacokinetics and pharmacodynamics of allopurinol and oxypurinol.” Clinical pharmacokinetics 46, no. 8 (2007): 623-644.
- Alexander, Kenneth S., Nipun Davar, and Gordon A. Parker. “Stability of allopurinol suspension compounded from tablets.” International journal of pharmaceutical compounding 1, no. 2 (1997): 128-131.
