EVANSVILLE, IN (July 1) – As summer temperatures soar, standard heat warnings may be missing a major, life-saving vulnerability: how common antidepressants impair the body’s ability to handle extreme heat.
With mental health medication use at an all-time high, millions of individuals taking selective serotonin reuptake inhibitors (SSRIs) like Lexapro, Zoloft, and Prozac may be unknowingly exposing themselves to severe heat-related illnesses.
Joe Merkel, Pharmacy Manager at Ascension St. Vincent, is advising the public about how these medications alter the body’s natural ability to regulate temperature through three critical factors.
“They can cause your body to over sweat which could lead to dehydration,” Merkel said. “But sometimes, it won’t sweat enough and lead to heat exhaustion.”
Brain Disruption: SSRIs increase serotonin in the hypothalamus—the brain’s internal thermostat—disrupting natural climate control.
The Sweating Paradox: This chemical shift can cause excessive sweating that rapidly accelerates dehydration. Conversely, it can sometimes prevent the body from sweating enough, leading directly to heat exhaustion.
Muted Warning Signs: The medication can simultaneously blunt a person’s awareness that they are overheating, dangerously spiking the risk of sudden heat stroke.
“Always play it safe. So, if you feel anything that’s out of the normal, you really need to sit down, relax, kind of get out of the environment,” Merkel says. “Then, let somebody know. Let your doctor know. Let a health professional know what you’re experiencing. They can help you.”
Ultimately, raising awareness about how these everyday medications disrupt the body’s natural cooling system is a vital, life-saving step toward keeping individuals safe during extreme summer heat.
