As I noted in my last column, I recently had a generic cold.
One of the more irritating aspects is that I usually get a cough that lasts a few weeks afterwards, and, like most people, I try to do something about it. So I load up on various over-the-counter remedies.
I have no idea if they work, or if I’m shelling out for a placebo. I’m not alone in buying these, or they wouldn’t be on the market, or making money, at all.
But the placebo effect is pretty strong. Phenylephrine has been around since 1938. It’s sold on its own and is an ingredient in almost every anti-cough/cold combination medication out there (NyQuil, DayQuil, Robitussin Multi-Symptom, and their many generic store brands). Millions of people use it every year.
Dr. Allan M. Block
Yet, after sifting through piles of accumulated data, the Food and Drug Administration announced earlier this year that phenylephrine ... doesn’t do anything. Zip. Zero. Nada. When compared with a placebo in controlled trials, you couldn’t tell the difference between them. So now the use of it is being questioned. CVS has started pulling it off their shelves, and I suspect other pharmacies will follow.
But back to my cough. A time-honored tradition in American childhood is having to cram down Robitussin and gagging from its nasty taste (the cherry and orange flavoring don’t make a difference, it tastes terrible no matter what you do). So that gets ingrained into us, and to this day I, and most adults, reach for a bottle of dextromethorphan when they have a cough.
But the evidence for that is spotty, too. Several studies have shown equivocal, if any, evidence to suggest it helps with coughs, though others have shown some. Nothing really amazing though.
But we still buy it by the gallon when we’re sick, because we want something, anything, that will make us better. Even if we’re doing so more from hope than conviction.
There’s also the old standby of cough drops, which have been used for more than 3,000 years. Ingredients vary, but menthol is probably the most common one. I go through those, too. I keep a bag in my desk at work. In medical school, during cold season, it was in my backpack. I remember sitting in the Creighton library to study, quietly sucking on a lozenge to keep my cough from disturbing other students.
But even then, the evidence is iffy as to whether they do anything. In fact, one interesting (though small) study in 2018 suggested they may actually prolong coughs.
The fact is that we are all susceptible to the placebo effect, regardless of how much we know about illness and medication. Maybe these things work, maybe they don’t, but it’s a valid question. How often do we let wishful thinking beat objective data?
Probably more often than we want to admit.
Dr. Block has a solo neurology practice in Scottsdale, Ariz.