7 Common Medications That Can Cause or Worsen Snoring

Why Your Prescription May Be Making You Snore

Snoring is caused by the vibration of soft tissue in the upper airway when muscles relax too much during sleep. Many widely-prescribed medications directly amplify this effect — either by chemically relaxing the pharyngeal muscles that keep the airway open, or by causing nasal and throat irritation that narrows the air passage. If your snoring started or worsened after beginning a new medication, this list is your starting point.

Important: never stop or change a prescribed medication without consulting your doctor first. In many cases, your physician can adjust the dose, switch to an alternative drug in the same class, or change the timing of administration to reduce the snoring effect while maintaining therapeutic benefit.

1. Benzodiazepines (Diazepam, Lorazepam, Clonazepam)

Benzodiazepines — prescribed for anxiety, panic disorder, seizures, and insomnia — work by enhancing GABA activity in the brain, producing sedation and muscle relaxation throughout the body, including the pharyngeal muscles of the upper airway. This chemical relaxation reduces the tone of the soft palate, uvula, and tongue base, making airway collapse significantly more likely during sleep. Research published in the Journal of Clinical Sleep Medicine has documented that benzodiazepine use is associated with measurably increased apnea-hypopnea index scores. Ask your doctor: whether a lower dose, an earlier administration time, or a non-benzodiazepine alternative is possible for your condition.

2. Non-Benzodiazepine Sleeping Pills (Zolpidem/Ambien, Eszopiclone/Lunesta)

Zolpidem and related “Z-drugs” target the same GABA receptor complex as benzodiazepines. Although they were marketed as having fewer muscle-relaxant side effects, in practice they produce a similar softening of the pharyngeal musculature during peak drug levels in the bloodstream — typically in the first two to four hours after ingestion. Patients already prone to snoring often experience significantly worse episodes on nights they take these medications. The Mayo Clinic lists sedative-hypnotics as a primary pharmacological snoring trigger. Ask your doctor: whether cognitive behavioral therapy for insomnia (CBT-I) might reduce your reliance on sleep medication over time.

3. First-Generation Antihistamines (Diphenhydramine/Benadryl)

First-generation antihistamines like diphenhydramine (found in Benadryl, Tylenol PM, ZzzQuil, and many OTC sleep aids) cause snoring through a double mechanism. First, they cross the blood-brain barrier and produce central nervous system sedation that relaxes airway muscles. Second, their anticholinergic action dries out mucous membranes, reducing natural lubrication in the nasal passages and throat — paradoxically increasing tissue friction and vibration. Ask your doctor: whether a second-generation antihistamine (cetirizine, loratadine, fexofenadine), which does not cross the blood-brain barrier and has no muscle-relaxant effect, could manage your allergy symptoms instead.

4. Beta Blockers (Metoprolol, Atenolol, Propranolol)

Beta blockers are widely prescribed for high blood pressure, heart failure, arrhythmias, and migraine prevention. They reduce the body's respiratory drive by blunting the sympathetic nervous system's response during sleep. This can suppress the normal arousal signals that would otherwise prompt a person to shift position or briefly wake when the airway becomes partially obstructed. The net result is that airway obstructions that would ordinarily be self-correcting are allowed to persist longer, increasing both snoring duration and the risk of progression toward obstructive sleep apnea. Ask your doctor: whether your target blood pressure or cardiac goals could be achieved with an alternative drug class.

5. ACE Inhibitors (Lisinopril, Enalapril, Ramipril)

ACE inhibitors, among the most commonly prescribed blood pressure medications, cause a chronic dry cough in approximately 10–20% of patients due to accumulation of bradykinin in the airways. This persistent throat irritation produces inflammation and swelling of the posterior pharynx. While the cough itself is the most frequently reported complaint, the underlying tissue inflammation also increases the likelihood of airway narrowing and snoring during sleep. Ask your doctor: whether switching to an angiotensin receptor blocker (ARB) — such as losartan or valsartan — which does not share this side effect mechanism, would be appropriate for your blood pressure management.

6. Testosterone Therapy (Injections, Gels, Patches)

Testosterone therapy is increasingly used for hypogonadism, gender-affirming care, and off-label performance purposes. Elevated testosterone levels are associated with increased fat deposition in the soft tissue of the upper airway, particularly around the lateral pharyngeal walls. This structural change physically narrows the airway lumen. Additionally, testosterone can stimulate upper airway instability through central mechanisms. A study in Journal of Clinical Sleep Medicine found that testosterone users had significantly higher rates of sleep-disordered breathing than controls. Ask your doctor: whether dose adjustment or switching delivery method could reduce the magnitude of this effect.

7. Muscle Relaxants (Cyclobenzaprine/Flexeril, Baclofen, Carisoprodol)

Skeletal muscle relaxants prescribed for back pain, spasms, and musculoskeletal injuries act throughout the body — including the dilator muscles of the pharynx that actively hold the airway open during sleep. When these muscles are pharmacologically relaxed, the airway is more prone to collapse under the negative pressure generated during inhalation. Cyclobenzaprine is particularly noted for this effect due to its structural similarity to tricyclic antidepressants, which are themselves associated with increased snoring. Ask your doctor: whether non-pharmacological approaches (physical therapy, topical agents) or a different medication timing could minimize the overlap with peak sleep-phase airway relaxation.

Managing Medication-Related Snoring

If you suspect a medication is worsening your snoring, bring a log of your snoring nights (recorded with a smartphone app) alongside your medication schedule to your next appointment. The correlation between pill-taking nights and snoring severity is often the most convincing data point for a prescribing physician. In many cases, timing adjustments — taking a drug earlier in the evening so peak drug levels occur before deep sleep rather than during it — can meaningfully reduce the snoring effect without changing the therapeutic outcome.

Where pharmacological muscle relaxation cannot be avoided, a mandibular advancement device provides a mechanical counterforce. The Snorple mouthpiece physically repositions the jaw and tongue to hold the airway open, partially offsetting the drug-induced reduction in pharyngeal muscle tone. It is not a substitute for a medication review with your doctor, but for many patients it is a practical nightly companion to ongoing treatment.