Summer Heat and Your Medications: What You Need to Know 

With summer in full swing, it is important to be mindful of how the heat can affect your body—especially if you are taking certain medications. Some prescriptions can change how your body responds to heat or increase your risk of dehydration, making you more susceptible to heat-related illnesses. 

“Many people don’t realize how much heat can amplify the effects of common medications,” says Peter Patel PharmD, director of outpatient pharmacy at PIH Health. “If you’re taking medicine that affects hydration or how your body regulates heat, it’s essential to stay cool, drink plenty of water, and check in with your healthcare provider when temperatures spike.” 

Here are a few types of medications that can interact with heat: 

Diuretics (Water Pills) 

Commonly prescribed for high blood pressure and heart failure, diuretics help your body eliminate excess fluid. But in hot weather, you naturally lose more of your body water through sweat—diuretics can intensify this, increasing your risk of dehydration and electrolyte imbalance. 

Heart Medications 

Beta blockers and calcium channel blockers help control heart rate and blood pressure, but they may limit your body’s ability to regulate temperature by reducing blood flow to the skin. This can make it harder to cool off in the heat. 

Antidepressants 

Some antidepressants—especially tricyclic antidepressants (TCAs) and selective serotonin reuptake inhibitors (SSRIs)—can interfere with the body’s ability to regulate temperature. They may reduce your ability to sweat or affect the brain’s heat regulation center, increasing your risk of overheating. 

Stimulants 

Medications commonly used to treat ADHD, such as amphetamines (e.g., Adderall) and methylphenidate (e.g., Ritalin), can increase body temperature and heart rate. This makes it harder for your body to stay cool, especially during physical activity or in hot weather. They can also suppress thirst, making dehydration more likely. 

If you are taking stimulants, it is important to stay hydrated, take breaks from the heat, and avoid overexertion. 

Other Medications to Watch 

• Antipsychotics may impair your ability to sweat
• Antihistamines can cause dry mouth and reduce sweating 

Tips for Staying Safe: 

• Stay hydrated: Drink water regularly—even if you are not thirsty
• Avoid peak heat hours (usually 10 am to 4 pm)
• Check with your doctor or pharmacist if you are unsure how your medication might interact with heat
• Know the signs of heat exhaustion: dizziness, headache, nausea, and fatigue