Dextromethorphan
Dry Cough Relief Acting Directly on the Brain's Cough Centre
A dry, tickling cough with no phlegm disrupts sleep and daily life. Dextromethorphan suppresses the cough reflex at the medullary cough centre — relief within 15–30 minutes, lasting up to 6 hours.
💊 Available in 15 mg tablets and syrup for adults. For dry, non-productive cough only — a pharmacist can guide you to the right form.
👨⚕️ Consult a pharmacist online instantly — no travel, no queues, completely private and convenient.
🚚 Fast, confidential delivery — plain packaging with no product names on the outside, delivered safely to your door.
Dextromethorphan is a central antitussive acting on sigma-1 and NMDA receptors in the medullary cough centre, reducing cough without respiratory depression at therapeutic doses. Indicated for dry, non-productive cough — distinct from expectorants used to clear phlegm.
📊 Key clinical statistics:
- Dextromethorphan reduces dry cough frequency significantly vs placebo, with over 60% of patients reporting noticeable relief within the first hour
- A single dose of 15–30 mg acts within 15–30 minutes and lasts 4–6 hours
- Dextromethorphan carries no addiction risk at therapeutic doses — safer than opioid antitussives for OTC use
💊 At Intimo Life, Dextromethorphan covers key cough categories:
- Dry cough from cold or airway irritation — suppresses non-productive cough for better sleep and function
- Persistent dry cough unresponsive to other measures — short-term use under pharmacist guidance
⚠️ For dry, non-productive cough only. If phlegm is present use an expectorant. Consult a pharmacist before use — especially if taking MAOIs or SSRIs (serotonin syndrome risk).
Dextromethorphan
About Dextromethorphan
What is Dextromethorphan? How does it work?
Dextromethorphan (DXM) is a central antitussive suppressing the cough reflex at the medullary cough centre via sigma-1 and NMDA receptors — not opioid receptors.
- Sigma-1 receptor activity — reduces neural cough-trigger signals without opioid-like effects or dependence risk
- NMDA receptor antagonism — disrupts cough circuit signalling, decreasing frequency and intensity
- No respiratory depression — safer than opioid antitussives such as codeine at standard doses
Onset is 15–30 minutes; duration 4–6 hours per dose. Suitable for short-term dry, non-productive cough relief.
Which type of cough does Dextromethorphan treat? Dry or productive cough?
The correct cough medicine depends on cough type — two main types apply:
- Dry (non-productive) cough — no phlegm, tickling or irritating sensation, from a cold or airway irritation. Correct indication for Dextromethorphan, which suppresses the reflex centrally
- Productive (wet) cough — phlegm present that needs expelling. Do NOT use Dextromethorphan — suppressing cough traps mucus, worsening congestion. Use an expectorant such as guaifenesin or a mucolytic instead
If uncertain which type you have, consult a pharmacist before choosing a cough medicine to get the right treatment safely.
How do you take Dextromethorphan 15 mg? When and how often?
Standard Dextromethorphan dosing:
- Adults and children ≥12 years — 15–30 mg every 4–6 hours as needed; maximum 120 mg per day
- Children aged 6–11 years — 7.5–15 mg every 4–6 hours; maximum 60 mg per day. Consult a pharmacist first
- Children under 6 years — do not use without direct medical advice
Can be taken with or without food. For syrup, always use the measuring spoon provided — never a household tablespoon, as accuracy is critical to avoid overdose.
What are the side effects of Dextromethorphan? Does it cause drowsiness?
Dextromethorphan at standard doses has a mild side-effect profile:
- Drowsiness and dizziness — may occur, especially at higher doses or with other medications; caution when driving or using machinery
- Nausea or mild stomach discomfort — uncommon; taking with food helps
- Allergic reaction — rash, swelling, difficulty breathing (rare); stop immediately and consult a pharmacist
Dextromethorphan is less sedating than antihistamine-based suppressants like chlorpheniramine, but individual responses vary. Observe how it affects you before driving, especially on first use.
What are the cautions and drug interactions for Dextromethorphan? MAOI and SSRI risks?
Key drug interactions and cautions for Dextromethorphan:
- MAOIs — absolutely contraindicated. Concurrent use risks life-threatening serotonin syndrome (confusion, high fever, rigidity, rapid heart rate). Wait ≥14 days after stopping an MAOI before taking Dextromethorphan
- SSRIs and SNRIs — raises serotonin syndrome risk. Always consult a pharmacist if taking these antidepressants
- Pregnancy and breastfeeding — safety data limited; avoid and consult a doctor or pharmacist first
- Hepatic impairment — metabolised by the liver; use with extra caution in liver disease
Avoid in chronic asthma or significant phlegm — cough suppression can trap secretions, worsening the condition.
How does Dextromethorphan compare with other cough medicines — expectorants and antihistamines?
Cough medicines have different mechanisms — match the medicine to the cough type:
- Dextromethorphan (Antitussive) — suppresses cough centrally; dry non-productive cough; less sedating than antihistamines
- Guaifenesin (Expectorant) — thins mucus; wet productive cough; does not suppress the reflex
- Chlorpheniramine / Diphenhydramine (Antihistamine) — allergy or post-nasal drip cough; causes drowsiness
- Bromhexine / Ambroxol (Mucolytic) — breaks down thick secretions; productive cough with viscous phlegm
Dry cough → Dextromethorphan / productive cough → expectorant or mucolytic / allergy cough → antihistamine. Consult a pharmacist to confirm.
Dextromethorphan generic vs brand — what is the difference? What are TERCO-D and D-COATE?
Dextromethorphan is available in generic and branded forms — all contain the same active ingredient, Dextromethorphan HBr.
- Generic Dextromethorphan — 15 mg tablets or 15 mg/5 ml syrup; Thai FDA-registered; typically more affordable
- TERCO-D — branded Dextromethorphan available in the Thai market
- D-COATE — another branded Dextromethorphan product in Thailand
Generics must prove bioequivalence to the originator — equivalent absorption rate and blood concentration. At the same dose, effect is equivalent. Discuss brand vs generic with a pharmacist based on your budget and needs.
⚠️ ข้อจำกัดความรับผิดชอบ
เนื้อหาในบทความนี้มีจุดประสงค์เพื่อให้ความรู้ทั่วไปเท่านั้น ไม่ได้มีเจตนาทดแทนคำแนะนำ การวินิจฉัย หรือการรักษาจากแพทย์หรือเภสัชกรผู้เชี่ยวชาญ หากมีข้อสงสัยเกี่ยวกับอาการหรือการใช้ยา ควรปรึกษาแพทย์หรือเภสัชกรก่อนเสมอ
- Dextromethorphan — Drug Information — MedlinePlus (NIH)
- Dextromethorphan — Drug Label Database — DailyMed (NLM/NIH)
- Dextromethorphan — Compound Summary — PubChem (NCBI/NIH)
- Over-the-Counter Medicines (DXM) — NIDA (NIH)
- Cough — Health Topic Overview — MedlinePlus (NIH)
Frequently Asked Questions about Dextromethorphan
Dextromethorphan is indicated only for dry, non-productive cough — for example, a tickling throat cough after a cold. If you have phlegm or a productive (wet) cough, use an expectorant such as guaifenesin or a mucolytic instead. Suppressing a productive cough traps mucus in the lungs, which can worsen your condition. Consult a pharmacist to confirm your cough type and receive the right medicine.
Dextromethorphan can cause drowsiness or dizziness in some people, especially on first use or at higher doses. It is advisable to observe your own response after the first dose before driving or operating machinery. Dextromethorphan is generally less sedating than antihistamine-based cough suppressants, but individual reactions vary — err on the side of caution when driving until you know how it affects you.
Dextromethorphan can generally be combined with antihistamines such as cetirizine or chlorpheniramine. However, first-generation antihistamines like chlorpheniramine may increase sedation when combined. Always consult a pharmacist before taking multiple medications together, particularly if using combination cough-cold products that may already contain an antihistamine, to avoid duplicate ingredients or unwanted interactions.
Dextromethorphan is not recommended for children under 6 years of age except under direct medical supervision, due to risk of adverse effects in young children. For children aged 6–11, a reduced dose may be appropriate — only under explicit pharmacist or doctor guidance. Children 12 and over may use adult doses. Never give adult cough products to young children without consulting a pharmacist or doctor first.
Pregnant or breastfeeding women should avoid Dextromethorphan where possible, as human safety data during pregnancy and lactation is limited and inconclusive. Always consult a doctor or pharmacist before taking any cough medicine during pregnancy or while nursing, to ensure the safest option is selected for both mother and baby.
If cough does not improve after 7 days of Dextromethorphan use, or if any of the following occur, seek medical attention promptly: fever above 38.5°C, yellow or green phlegm, chest pain, difficulty breathing, or coughing up blood. These symptoms may indicate a bacterial infection, pneumonia, or another underlying cause that requires specific medical treatment beyond a standard cough suppressant.
Dextromethorphan is not addictive at standard therapeutic doses. However, taking it at doses far above the recommended amount — known as DXM misuse — can produce dissociation, hallucinations, dangerous heart rhythm changes, and other life-threatening effects. Always use Dextromethorphan only as directed, never exceeding the maximum of 120 mg per day. Keep medicines out of reach of children and adolescents.
Dextromethorphan is available online at Intimo Life — consult our pharmacist via LINE before ordering to confirm your cough type and receive appropriate dosing guidance. Generic Dextromethorphan is generally affordable and accessible. Orders are dispatched promptly in plain packaging with no product names visible, ensuring complete privacy throughout the process.
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