Staying Safe in the Heat: How Medications Can Change Your Body’s Response
Staying Safe in the Heat: How Medications Can Change Your Body’s Response
As summer temperatures rise, workers in outdoor, industrial, and high‑heat environments face an increased risk of heat‑related illness. While hydration and rest breaks are widely recognized as essential, far fewer people realize that certain medications can significantly alter how the body responds to heat. Some medications interfere with the body’s natural cooling system, increase dehydration, or cause drowsiness and dizziness — all of which can elevate the risk of heat exhaustion, heat stroke, and workplace injuries [1].
The Centers for Disease Control and Prevention (CDC) notes that several medications can impair temperature regulation and reduce the body’s ability to respond safely to heat exposure [1]. These effects can be especially dangerous for employees in physically demanding roles such as construction, manufacturing, landscaping, agriculture, transportation, and warehouse operations.
How the Body Normally Cools Itself
The body protects itself from overheating through two primary mechanisms:
Sweating, which cools the body as moisture evaporates
Increased blood flow to the skin, which helps release heat
Proper hydration supports both processes. However, certain medications can disrupt these protective systems [1].
Medications That May Increase Heat‑Related Risk
Several commonly used medications can interfere with the body’s ability to cool itself or recognize early signs of overheating:
Diuretics — Increase fluid loss, raising the risk of dehydration and electrolyte imbalance [1]
Antidepressants, antipsychotics, and anticholinergic medications — May reduce sweating or impair temperature regulation [1]
Opioids and benzodiazepines — Can cause drowsiness, slowed reaction time, and reduced awareness of heat‑related symptoms [1]
NSAIDs — May increase the risk of kidney injury when dehydration occurs [1]
The Occupational Safety and Health Administration (OSHA) emphasizes that workers exposed to high temperatures, direct sunlight, heavy physical labor, or protective equipment already face elevated heat‑stress risk — and medications can further increase vulnerability [2].
Recognizing Heat‑Related Illness
Heat‑related illness can range from mild to life‑threatening. Early symptoms may include:
dizziness
fatigue
headache
muscle cramps
nausea
heavy sweating
weakness
Without prompt intervention, heat exhaustion can progress to heat stroke, a medical emergency that can cause confusion, loss of consciousness, organ damage, or death [3].
Medication‑related heat sensitivity may also increase the likelihood of workplace accidents. Workers experiencing dizziness, dehydration, fatigue, or impaired concentration may be more susceptible to falls, equipment‑related injuries, and reduced job performance.
How to Reduce Risk
Employers and claims professionals can play a critical role in preventing heat‑related illness by:
encouraging regular hydration
providing shaded or cooled rest areas
scheduling breaks during peak heat
adjusting workloads when temperatures rise
monitoring workers who may be at higher risk
educating employees about medication‑related heat sensitivity
Workers should be encouraged to speak with their healthcare providers or pharmacists about whether their medications may affect heat tolerance. Importantly, employees should never stop taking prescribed medications without medical guidance.
By Merna Khalil
PharmD Candidate (P3)
For questions, e-mail pharmd@prodigyrx.com
Citations
1. Centers for Disease Control and Prevention. Heat and medications – guidance for clinicians. CDC. Updated May 15, 2024. Accessed May 29, 2026. https://www.cdc.gov/heat-health/hcp/clinical-guidance/heat-and-medications-guidance-for-clinicians.html2. Occupational Safety and Health Administration. Heat exposure and heat illness prevention. OSHA. Accessed June 1, 2026. https://www.osha.gov/heat-exposure3. Centers for Disease Control and Prevention. About heat and your health. CDC. Updated April 24, 2024. Accessed June 3, 2026. https://www.cdc.gov/heat-health/about/index.html