What medications are associated with dry eyes and mouth?

Medications Associated with Dry Eyes and Mouth

Multiple medication classes can cause or exacerbate dry eyes and dry mouth, with anticholinergics, antihistamines, antidepressants, and antihypertensives being the most common culprits. 1, 2

Common Medication Classes That Cause Dry Eyes and Mouth

Anticholinergic Medications

• Mechanism: Block muscarinic receptors (particularly M3) that regulate secretory function in lacrimal and salivary glands
• Examples:
  • Antispasmodics
  • Bladder control medications
  • Some over-the-counter sleep aids

Antihistamines

• Both first and second-generation antihistamines can cause dryness 1, 2
• First-generation antihistamines (e.g., diphenhydramine) typically cause more severe dryness due to stronger anticholinergic effects

Antidepressants

• SSRIs (selective serotonin reuptake inhibitors): Cause dry eye through mechanisms beyond anticholinergic effects 3
• Tricyclic antidepressants (e.g., amitriptyline): Have significant anticholinergic side effects including dry mouth, blurred vision, and urinary retention 4
• SNRIs (serotonin-norepinephrine reuptake inhibitors): Also associated with dry eye but possibly to a lesser extent than SSRIs 3

Antihypertensives

• Beta-blockers
• Diuretics
• ACE inhibitors (interestingly, these may be associated with lower risk of dry eye according to the Beaver Dam Eye Study) 2

Other Notable Medications

• Systemic retinoids (e.g., isotretinoin for acne): Strongly associated with dry eyes and mouth 1, 2
• Hormone replacement therapy: Particularly estrogen-only therapy increases risk of dry eye 1, 2
• Oral corticosteroids: Associated with increased risk of dry eye 2
• Benzodiazepines and sedative-hypnotics: May contribute to dry eye 2
• Botulinum toxin: Can cause dry eye when used in facial areas 1

Clinical Considerations

Risk Factors That Compound Medication Effects

• Polypharmacy: Multiple medications with drying effects can have additive impact 5
• Age: Elderly patients are more susceptible to medication-induced dryness 4, 6
• Environmental factors: Air conditioning, heating, wind, and low humidity can worsen medication-induced dryness 1, 2
• Screen time: Reduced blink rate during screen use exacerbates dry eye symptoms 2

Management Approaches

1. Medication review: Identify all medications with potential drying effects
2. Dose adjustment: Consider reducing dosage when possible 7
3. Medication alternatives: Switch to medications within the same class that have fewer drying effects 7
4. Timing optimization: Adjust medication schedule to minimize peak drying effects 6
5. Supportive care: Artificial tears, humidifiers, and increased water intake

Pitfalls and Caveats

• Topical ocular medications with preservatives (especially benzalkonium chloride) can themselves cause or worsen dry eye 1, 5
• Dry eye symptoms may be mistakenly attributed solely to age rather than medication effects
• Discontinuing medications abruptly can cause withdrawal symptoms; any medication changes should be supervised by a healthcare provider 4
• Some medications (like ACE inhibitors) may actually have protective effects against dry eye 2

Remember that medication-induced dry eyes and mouth can significantly impact quality of life and medication adherence. Identifying and addressing these side effects is crucial for patient comfort and treatment success.