Heat and steam from your shower or shave can rob medicine of its potency long before the drug's expiration date. Angela Cappetta/Getty Images hide caption
Heat and steam from your shower or shave can rob medicine of its potency long before the drug's expiration date.
Most of us have reached for a painkiller, at one time or another, only to discover the date on the label shows it has expired. But what does an "expiration" date on medicine really mean? Is it dangerous if you take it anyway? Less effective?
It turns out that date stamped on the label actually means a lot. It's based on scientific evidence gathered by the manufacturer showing how long the drug's potency lasts. Companies expose their medications to different environments, different temperatures and humidity levels to see just how long it takes for the medication to degrade to the point that its effectiveness is compromised.
The general rule, says pharmacist Mike Fossler, with the American College of Clinical Pharmacology, is that once a drug is degraded by 10 percent it has reached "the end of its useful life." If you take it months or even years past the expiration date, it's unlikely to do you any harm, he says; it just might not do you much good.
That may not be a big deal if you're treating a headache, but if you're fighting a bacterial infection with antibiotics like amoxicillin or ciprofloxacin, for example, using less than fully potent drugs could fail to treat the infection and lead to more serious illness.
Pharmacist Mohamed Jalloh, a spokesman for the American Pharmacists Association, says there's an even bigger reason not to rely on old drugs: antibiotic resistance. When you inadvertently "underdose" yourself by taking antibiotics that aren't full strength, he says, you run the risk that the bacteria you're battling will figure out not only how to defeat this weakened drug, but other antibiotics, too.
At least 23,000 people each year in the U.S. die from infections that have become resistant to antibiotics, according to the Centers for Disease Control and Prevention.
"If your medicine has expired, don't use it," concurs Ilisa Bernstein, deputy director of the office of compliance in the Food and Drug Administration's Center for Drug Evaluation and Research.
That goes for over-the-counter drugs, as well as prescription meds. Check the expiration date before even buying those pain relievers or allergy tablets, some pharmacists advise the same way you check your milk. Buy the one with the date that's furthest away.
"Once the expiration date has passed," Bernstein says, "there is no guarantee that the medicine will be safe and effective."
Of course, even new drugs can quickly lose potency if they're not stored properly. Get those pills out of the bathroom "medicine cabinet" now, pharmacists say. The steam from your shower or shave kills pills fast.
"Medicines like the kind of environment that people like a little dry and not too hot or cold," Fossler says. And, of course, don't take medication to the beach or leave it in a hot car. Like humidity, heat degrades a medicine's active ingredients.
Some medications are more vulnerable than others, so check the label. Insulin, certain immunotherapy drugs, and some children's pain relievers and cold remedies require refrigeration and protection from light.
And compared to capsules and tablets, "liquids are not as highly preserved," says Barbara Kochanowski, a scientist with the Consumer Healthcare Products Association. Liquid drugs can more easily become contaminated with bacteria and fungus.
Anytime you see a change in the color, odor or consistency of a drug such as a cream turning into a runny solution consider it a red flag, Kochanowski says, and consult your pharmacist. It's probably time to toss that medication.
Some drugstores, hospitals with pharmacies, drugmakers and drug-treatment centers have been authorized by the federal government, in recent years, to serve as "drug-take-back" sites for some drugs that are expired, or no longer needed. You can check the FDA and Drug Enforcement Agency websites for their latest guidance on the safest ways to dispose of various drugs.
Originally posted here:
Heat, Humidity And Aging Make Medicine Less Potent : Shots - NPR - NPR
- Yes, But. The Annotated Atlantic. - November 7th, 2009 [November 7th, 2009]
- Health Insurance Benefit Costs by Region - November 8th, 2009 [November 8th, 2009]
- For an Operator, Please Press... - November 8th, 2009 [November 8th, 2009]
- Pollyanna With a Pen: Maine Governor Signs 18 New Health Care Bills into Law - November 8th, 2009 [November 8th, 2009]
- AMA Sounds the Alarm, Medicare Making Yet Another Attempt to Cut Reimbursement - November 8th, 2009 [November 8th, 2009]
- Mass Governor Asks Blue Cross to Keep Higher Employer Contribution - November 8th, 2009 [November 8th, 2009]
- Lifespan and Care New England Plan Monopoly (Again) - November 8th, 2009 [November 8th, 2009]
- Dirigo Health: Con Artists, Liars, and Thieves? - November 8th, 2009 [November 8th, 2009]
- New Orleans: Health Challenges - November 8th, 2009 [November 8th, 2009]
- August a Flurry of Activity - November 8th, 2009 [November 8th, 2009]
- Maine's Dirigo Health Savings One-Third of Original Estimate - November 8th, 2009 [November 8th, 2009]
- “Methodolatry”: My new favorite term for one of the shortcomings of evidence-based medicine - November 8th, 2009 [November 8th, 2009]
- Suzanne Somers’ Knockout: Dangerous misinformation about cancer (part 1) - November 8th, 2009 [November 8th, 2009]
- A science-based blog about GMO - November 8th, 2009 [November 8th, 2009]
- A Not-So-Split Decision - November 8th, 2009 [November 8th, 2009]
- Military Medicine in Iraq - November 8th, 2009 [November 8th, 2009]
- The effective wordsmithing of Amy Wallace - November 8th, 2009 [November 8th, 2009]
- A Science Lesson from a Homeopath and Behavioral Optometrist - November 8th, 2009 [November 8th, 2009]
- Join CFI in opposing funding mandates for quackery in health care reform - November 8th, 2009 [November 8th, 2009]
- Mainstreaming Science-Based Medicine: A Novel Approach - November 8th, 2009 [November 8th, 2009]
- Those who live in glass houses… - November 8th, 2009 [November 8th, 2009]
- J.B. Handley of the anti-vaccine group Generation Rescue: Misogynistic attacks on journalists who champion science - November 8th, 2009 [November 8th, 2009]
- When homeopaths attack medicine and physics - November 8th, 2009 [November 8th, 2009]
- The cancer screening kerfuffle erupts again: “Rethinking” screening for breast and prostate cancer - November 8th, 2009 [November 8th, 2009]
- All Medicines Are Poison! - November 8th, 2009 [November 8th, 2009]
- When Loud Wins: Will Your Tax Dollars Pay For Prayer? - November 8th, 2009 [November 8th, 2009]
- It’s All in Your Head - November 8th, 2009 [November 8th, 2009]
- The Skeptical O.B. joins the Science-Based Medicine crew - November 8th, 2009 [November 8th, 2009]
- The Tragic Death Toll of Homebirth - November 8th, 2009 [November 8th, 2009]
- What’s the right C-section rate? Higher than you think. - November 8th, 2009 [November 8th, 2009]
- Recombinant Human Antithrombin – Milking Nanny Goats for Big Bucks - December 13th, 2009 [December 13th, 2009]
- Does C-section increase the rate of neonatal death? - December 13th, 2009 [December 13th, 2009]
- Man in Coma 23 Years – Is He Really Conscious? - December 13th, 2009 [December 13th, 2009]
- Why Universal Hepatitis B Vaccination Isn’t Quite Universal - December 13th, 2009 [December 13th, 2009]
- Ontario naturopathic prescribing proposal is bad medicine - December 13th, 2009 [December 13th, 2009]
- Naturopaths and the anti-vaccine movement: Hijacking the law in service of pseudoscience - December 13th, 2009 [December 13th, 2009]
- The Institute for Science in Medicine enters the health care reform fray - December 13th, 2009 [December 13th, 2009]
- Neti pots – Ancient Ayurvedic Treatment Validated by Scientific Evidence - December 13th, 2009 [December 13th, 2009]
- Early Intervention for Autism - December 13th, 2009 [December 13th, 2009]
- A temporary reprieve from legislative madness - December 13th, 2009 [December 13th, 2009]
- A critique of the leading study of American homebirth - December 13th, 2009 [December 13th, 2009]
- Lose those holiday pounds - December 13th, 2009 [December 13th, 2009]
- Endocrine disruptors—the one true cause? - December 13th, 2009 [December 13th, 2009]
- Acupuncture for Chronic Prostatitis/Chronic Pelvic Pain Syndrome - December 13th, 2009 [December 13th, 2009]
- Evidence in Medicine: Experimental Studies - December 13th, 2009 [December 13th, 2009]
- Midwives and the assault on scientific evidence - December 13th, 2009 [December 13th, 2009]
- The Mammogram Post-Mortem - December 13th, 2009 [December 13th, 2009]
- An Influenza Recap: The End of the Second Wave - December 13th, 2009 [December 13th, 2009]
- The End of Chiropractic - December 13th, 2009 [December 13th, 2009]
- Cell phones and cancer again, or: Oh, no! My cell phone’s going to give me cancer! (revisited) - December 20th, 2009 [December 20th, 2009]
- Another wrinkle to the USPSTF mammogram guidelines kerfuffle: What about African-American women? - December 20th, 2009 [December 20th, 2009]
- Acupuncture, the P-Value Fallacy, and Honesty - December 20th, 2009 [December 20th, 2009]
- The One True Cause of All Disease - December 20th, 2009 [December 20th, 2009]
- Communicating with the Locked-In - December 20th, 2009 [December 20th, 2009]
- Are the benefits of breastfeeding oversold? - December 20th, 2009 [December 20th, 2009]
- Measles - December 20th, 2009 [December 20th, 2009]
- Radiation from medical imaging and cancer risk - December 21st, 2009 [December 21st, 2009]
- Multiple Sclerosis and Irrational Exuberance - December 21st, 2009 [December 21st, 2009]
- Medical Fun with Christmas Carols - December 22nd, 2009 [December 22nd, 2009]
- Lithium for ALS – Angioplasty for MS - December 23rd, 2009 [December 23rd, 2009]
- “Toxins”: the new evil humours - December 24th, 2009 [December 24th, 2009]
- 2009’s Top 5 Threats To Science In Medicine - December 24th, 2009 [December 24th, 2009]
- Buteyko Breathing Technique – Nothing to Hyperventilate About - December 26th, 2009 [December 26th, 2009]
- The Graston Technique – Inducing Microtrauma with Instruments - December 29th, 2009 [December 29th, 2009]
- The “pharma shill” gambit - December 29th, 2009 [December 29th, 2009]
- Ginkgo biloba – No Effect - December 30th, 2009 [December 30th, 2009]
- Oppose “Big Floss”; practice alternative dentistry - January 1st, 2010 [January 1st, 2010]
- Causation and Hill’s Criteria - January 3rd, 2010 [January 3rd, 2010]
- The life cycle of translational research - January 10th, 2010 [January 10th, 2010]
- The anti-vaccine movement strikes back against Dr. Paul Offit - January 10th, 2010 [January 10th, 2010]
- Osteoporosis Drugs: Good Medicine or Big Pharma Scam? - January 10th, 2010 [January 10th, 2010]
- Acupuncture for Hot Flashes - January 10th, 2010 [January 10th, 2010]
- The case for neonatal circumcision - January 10th, 2010 [January 10th, 2010]
- A victory for science-based medicine - January 10th, 2010 [January 10th, 2010]
- James Ray and testosterone replacement therapy (TRT) - January 10th, 2010 [January 10th, 2010]
- The Water Cure: Another Example of Self Deception and the “Lone Genius” - January 12th, 2010 [January 12th, 2010]
- Be careful what you wish for, Dr. Dossey, you just might get it - January 13th, 2010 [January 13th, 2010]
- You. You. Who are you calling a You You? - January 15th, 2010 [January 15th, 2010]
- The War on Salt - January 16th, 2010 [January 16th, 2010]
- Is breech vaginal delivery safe? - January 16th, 2010 [January 16th, 2010]