Post-nasal drip is mucus running down your throat - and the fix depends on the cause. The universal helpers: saline nasal rinses, aggressive hydration (thin mucus drips less), and sleeping propped up. Then target the cause: allergy, cold, or reflux.
By cause: allergies (the commonest) - a daily nasal steroid spray (fluticasone, OTC) is the most effective fix, plus a non-drowsy antihistamine; expect days, not hours, for the spray to peak. A cold - time, saline, and a decongestant like pseudoephedrine for the thick phase; it clears as the cold does. Reflux (the surprise cause - 'silent reflux' reaches the throat and mimics drip) - earlier dinners, less alcohol and caffeine, and an acid reducer if the pattern fits (worse in the morning, with hoarseness or throat-clearing). Dry air thickens mucus and makes any cause worse - a humidifier helps. The habits that matter: more water than you think (thin mucus drains invisibly; thick mucus announces itself), saline rinse or spray twice daily, and skip decongestant nasal sprays past 3 days (rebound congestion reads exactly like drip). See a clinician when: it lasts past a few weeks despite this, is one-sided, comes with facial pain or fever (sinus infection territory), or there is blood in the mucus. Emergencies skip this list: chest pain, trouble breathing, stroke signs, severe bleeding, or thoughts of self-harm mean call 911, or 988 for a mental health crisis in the US.
What to do
Common questions
Why won't my post-nasal drip cough go away?
Because the drip keeps landing on your throat's cough sensors - suppressing the cough without fixing the drip is mopping with the tap running. Fix the source: saline rinses twice daily, a nasal steroid if allergy is the driver, hydration, and a humidifier. Night cough specifically: prop the head of the bed, and honey before sleep genuinely reduces the cough. If it has run past 3 weeks despite this, the cause is probably not a cold - reflux, allergies, or a lingering sinus issue need a clinician's read.
What's the best medicine for post-nasal drip?
By cause: allergy-driven - a nasal steroid spray (fluticasone or triamcinolone, both OTC generics) is the strongest single treatment, with cetirizine or loratadine as backup; older antihistamines like diphenhydramine dry secretions but sedate and thicken mucus - a trade-off. Cold-driven - pseudoephedrine (behind the counter) during the thick phase. Reflux-driven - an acid reducer. There is no single 'drip pill' because drip is three problems wearing one name.
Can acid reflux really cause post-nasal drip?
Yes - laryngopharyngeal ('silent') reflux sends acid vapor high enough to irritate the throat, which responds by producing protective mucus: the drip sensation, chronic throat-clearing, morning hoarseness, and a lump-in-throat feeling, often with zero heartburn. The pattern clues: worse in the morning or when lying down, worse after coffee, alcohol or late meals. The test-drive: earlier dinners, less alcohol and caffeine, bed-head elevation - if the 'drip' fades in two weeks, reflux was your cause.
When does post-nasal drip need a doctor?
Past 3 to 4 weeks despite the home routine, strictly one-sided symptoms, facial pain or fever (bacterial sinusitis), blood in the mucus more than flecks, or drip with ear pain or hearing changes (the ears connect). Also worth a visit: drip plus wheezing - the drip-asthma overlap is common and treatable. Telehealth handles the evaluation well; the fix is usually a prescription-strength version of the right category. Emergencies skip this list: chest pain, trouble breathing, stroke signs, severe bleeding, or thoughts of self-harm mean call 911, or 988 for a mental health crisis in the US.