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Have you ever had to rush to the restroom to keep from wetting your pants? We think of this as a child’s problem, but adults also can suffer from what doctors call urinary urgency.

Urgency, leaks and frequency together make up a syndrome – overactive bladder (OAB). These symptoms overlap with those signaling conditions like urinary tract infections or interstitial cystitis that call for medical attention.

Drug companies have made OAB into a household word, however. TV commercials for prescription drugs like Detrol feature people who need a pee break in the most embarrassing situations, such as while directing traffic.

The Food and Drug Administration recently decided that symptoms of overactive bladder could be treated without a prescription. The agency approved a drug called Oxytrol. The active ingredient, oxybutynin, has been sold by prescription as Ditropan. Oxytrol will be a patch rather than a pill.

Most people like the idea of easy access to drugs that were once prescription-only. The popularity of brands such as Advil, Aleve, Motrin IB, Prilosec OTC and Prevacid demonstrate the success companies can achieve by switching their off-patent prescriptions to OTC status. Add to that the embarrassment factor for OAB, and it is likely that Oxytrol will sell well.

There are problems with such switches, however. People often assume that nonprescription drugs don’t have serious side effects, but that can be a dangerous assumption.

We are surprised and dismayed that the FDA decided to approve nonprescription oxybutynin. Common side effects include dry mouth, dizziness, constipation, drowsiness, nausea, headache, blurred vision, difficult urination, upset stomach, jitteriness, dry eyes and insomnia.

Oxybutynin also could cause some really dangerous reactions, including hallucinations, psychotic reactions, seizures and heart-rhythm disturbances. In addition, the drug may raise blood pressure and increase the risk of glaucoma.

The consequence that worries us the most, however, is confusion. Oxybutynin and similar medications work by blocking a nerve-messenger chemical called acetylcholine. Scientists call them anticholinergic drugs. They can cause mental fogginess in susceptible people.

While the elderly are especially vulnerable, you don’t have to be old to experience cognitive problems.

One reader wrote: “I am a 49-year-old female who has been on Ditropan for a few years. I had my family doctor refer me to a psychiatrist because I was having much more trouble remembering things.

“On my first visit to the specialist, I gave her a list of all the medications I was on. (I was taking six medications and had to write them down, as I could never remember them.) As soon as she saw the Ditropan, she told me that confusion is a side effect.

“I never even tied the two together. The bladder and the head are rather far apart! I immediately stopped taking the Ditropan and felt much better right away. I was attributing my depression and confusion to menopause. It worries me that there could be thousands of people suffering and not making the connection.”

We are concerned about OTC availability of oxybutynin. Memory loss and confusion are hardly a fair trade for fewer trips to the bathroom.

We provide more details on the hazards of anticholinergic drugs in Chapter 10 of “Top Screwups Doctors Make and How to Avoid Them,” available in libraries, bookstores and online (www.PeoplesPharmacy.com).