Top 10 Medications That Cause Dry Mouth and Why They Do

Last updated: September 2026

What Medications Cause Dry Mouth?

The medications most likely to cause dry mouth are antihistamines, antidepressants, decongestants, blood pressure medicines, bladder-control drugs, opioid pain relievers, anti-anxiety medicines, and muscle relaxants. Many of them block acetylcholine, the chemical signal that tells your salivary glands to make saliva. Hundreds of prescription and over-the-counter drugs list dry mouth as a side effect, and the effect often compounds when you take more than one.

Below are the 10 most common culprits, why each one dries you out, and what to ask your prescriber.

1) Antihistamines (for allergies & colds)

Why they dry you out: Many antihistamines also block acetylcholine (anticholinergic effect), reducing saliva. American Dental Association
Examples: Diphenhydramine, cetirizine, loratadine. GoodRx
What to do: Ask about non-drying alternatives or daytime, non-sedating options; use saliva-stimulating strategies below. Mayo Clinic

2) Antidepressants (SSRIs, SNRIs, TCAs, bupropion)

Why: Many antidepressants decrease salivary flow; TCAs are notably anticholinergic. American Dental Association
Examples: Sertraline/fluoxetine (SSRIs), venlafaxine/duloxetine (SNRIs), amitriptyline (TCA), bupropion. USC Ostrow School of Dentistry
What to do: Never stop abruptly. Discuss dose timing, alternative agents, or adjuncts for saliva support. Mayo Clinic

3) Decongestants & Cold Remedies

Why: Sympathomimetic agents (e.g., pseudoephedrine) reduce moisture in mucous membranes. American Dental Association
Examples: Pseudoephedrine, phenylephrine; many OTC combo cold tablets. USC Ostrow School of Dentistry
What to do: Consider saline rinses or non-decongestant options when appropriate. Mayo Clinic

4) Blood-Pressure Medicines (select classes)

Why: Several antihypertensives—including diuretics, beta-blockers, and centrally acting agents—are associated with dry mouth. American Dental Association
Examples: Hydrochlorothiazide (diuretic), metoprolol (beta-blocker), clonidine (central alpha-agonist). USC Ostrow School of Dentistry
What to do: Don’t change BP meds without guidance; ask if an alternative class is reasonable. Mayo Clinic

5) Bladder-Control Medicines (antimuscarinics)

Why: These directly block muscarinic receptors—saliva falls as a result. NIDCR
Examples: Oxybutynin, tolterodine, solifenacin. GoodRx
What to do: Dose adjustments, newer agents, or supportive measures may help. Mayo Clinic

6) Opioid Pain Relievers

Why: Opioids can slow salivary gland activity and contribute to dehydration. Mayo Clinic
Examples: Hydrocodone, oxycodone, morphine. GoodRx
What to do: Discuss non-opioid options when appropriate and increase saliva-friendly habits. Mayo Clinic

7) Anti-Anxiety & Sedative Medicines

Why: Medications used for anxiety and sleep (e.g., benzodiazepines) are commonly linked with dry mouth. Mayo Clinic
Examples: Alprazolam, lorazepam, diazepam. GoodRx
What to do: Review timing and necessity with your prescriber; use non-drug anxiety strategies where possible. Mayo Clinic

8) Muscle Relaxants

Why: Central and anticholinergic effects can suppress salivary flow. American Dental Association
Examples: Cyclobenzaprine, tizanidine. USC Ostrow School of Dentistry
What to do: If used at night, counter the morning “cottonmouth” with the relief tips below. Mayo Clinic

9) Asthma/COPD Bronchodilators (select agents)

Why: Certain inhaled bronchodilators may contribute to oral dryness. Rinsing after inhalers helps. USC Ostrow School of Dentistry
Examples: Albuterol, formoterol. USC Ostrow School of Dentistry
What to do: Use a spacer if appropriate and rinse mouth after use. USC Ostrow School of Dentistry

10) The Non-Medication You’re Probably Dealing With: Dehydration (incl. caffeine, alcohol, mouth-breathing)

Even without medicines, mild dehydration, caffeinated drinks, alcohol, or anxious mouth-breathing can make your mouth feel desert-dry. These are everyday triggers for nearly everyone at some point. Mayo Clinic

Why Do Anticholinergic Medications Cause Dry Mouth?

Your salivary glands produce saliva when acetylcholine binds to receptors on the gland. Anticholinergic drugs block those receptors, so the signal to make saliva is weakened. That is why diphenhydramine, tricyclic antidepressants like amitriptyline, and bladder medicines like oxybutynin are among the most drying drugs. The same effect explains why many of these medications also cause dry eyes and constipation.

Do Antihistamines Cause Dry Mouth?

Yes. Older antihistamines such as diphenhydramine (Benadryl) and chlorpheniramine are the most drying because they have strong anticholinergic effects. Newer options such as loratadine (Claritin) and fexofenadine (Allegra) are generally less drying, although cetirizine (Zyrtec) and other antihistamines can still cause it in some people. Diphenhydramine is also the sleep ingredient in many nighttime products, including Tylenol PM, which is why you may wake up with a dry mouth after taking one.

Can Blood Pressure Medication Cause Dry Mouth?

Yes. The blood pressure medicines most often linked to dry mouth are diuretics (water pills) such as hydrochlorothiazide and furosemide, beta blockers such as metoprolol and propranolol, and clonidine, which is known for causing significant dryness. Never stop or change a blood pressure medicine on your own. Ask your prescriber whether a different medication class or a change in dose timing makes sense for you.

What Medications Cause Dry Mouth at Night?

Saliva flow naturally slows during sleep, so medications taken at bedtime tend to hit hardest overnight. Common examples include sleep aids containing diphenhydramine or doxylamine, tricyclic antidepressants like amitriptyline, muscle relaxants like cyclobenzaprine, and bladder medicines like oxybutynin. Snoring and mouth breathing make it worse. A bedroom humidifier and water at your bedside can help, and your prescriber may be able to adjust when you take your dose.

What Medications Cause Dry Mouth and Dry Eyes?

Anticholinergic medications reduce both saliva and tears, so antihistamines, tricyclic antidepressants, and bladder-control medicines commonly cause both at the same time. If dry mouth and dry eyes persist together and no medication explains it, talk to your doctor. That combination can be a sign of Sjögren's syndrome, an autoimmune condition that affects the glands that produce tears and saliva.

Why Is Dry Mouth From Medication More Common in Older Adults?

Aging on its own is not the main cause. Older adults are more likely to take several medications every day, and the drying effects add up. Blood pressure medicines, bladder-control drugs, antidepressants, and sleep aids are a frequent combination. A pharmacist can review a full medication list, flag the most drying drugs, and share possible alternatives to discuss with the prescriber.

How to Manage Dry Mouth From Medication

While you work with your prescriber, focus on keeping saliva flowing and protecting your teeth:

• Sip water throughout the day, not only when you feel thirsty.
• Use sugar-free gum or sugar-free mints to stimulate saliva.
• Run a humidifier at night.
• Limit caffeine and alcohol, and choose an alcohol-free mouthwash.
• Keep up with dental checkups, since low saliva raises cavity risk.

For the full step-by-step plan, read how to get rid of dry mouth caused by medication.

Get Dry Mouth relief with Nokkomo Mints,
the sugar-free mints for medication dry mouth

Quick note: Nothing here is medical advice. If dry mouth is severe, persistent, or started after a new prescription, talk with your clinician before changing any medication. Mayo Clinic and National Institute of Dental and Craniofacial Research both recommend evaluating medicines as a leading cause. Mayo Clinic