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Pseudoephedrine: Uses, Dosage & Side Effects

Pseudoephedrine is a nasal decongestant used to relieve congestion caused by colds, allergies, and sinusitis. It works by narrowing blood vessels in the nasal passages to improve airflow.

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Things worth knowing about "Pseudoephedrine"

Pseudoephedrine is a nasal decongestant used to relieve congestion caused by colds, allergies, and sinusitis. It works by narrowing blood vessels in the nasal passages to improve airflow.

What is Pseudoephedrine?

Pseudoephedrine is a sympathomimetic agent and nasal decongestant used to relieve nasal congestion associated with the common cold, allergic rhinitis, and sinusitis. It belongs to the class of adrenergic drugs and acts directly on the blood vessels of the nasal mucosa.

Mechanism of Action

Pseudoephedrine mimics the effects of the body's own hormone adrenaline (epinephrine). It stimulates alpha- and beta-adrenergic receptors, causing vasoconstriction (narrowing of blood vessels) in the nasal mucosa. This reduces swelling, opens the nasal passages, and improves breathing. Compared to ephedrine, pseudoephedrine has a weaker effect on the cardiovascular system and a longer duration of action.

Indications

Nasal congestion due to the common cold or flu
Allergic rhinitis (hay fever)
Sinusitis (inflammation of the sinuses)
Support of Eustachian tube ventilation in middle ear infections

Dosage and Administration

Pseudoephedrine is commonly available in doses of 60 mg per tablet or capsule, often in combination with antihistamines or pain relievers. The standard adult dose is 60 mg every 4 to 6 hours, with a maximum of 240 mg per day. Use should be limited to a few days (generally no more than 7 days) to avoid rebound congestion.

In many countries, including the United States and Germany, pseudoephedrine is subject to special regulations. It can only be purchased in limited quantities and often requires showing identification, because it can be used as a precursor in the illegal manufacture of methamphetamine.

Side Effects

Increased blood pressure (hypertension)
Rapid or irregular heartbeat (tachycardia, palpitations)
Insomnia and nervousness
Headache and dizziness
Dry mouth
Urinary retention (especially in men with an enlarged prostate)
Rarely: seizures or cardiac arrhythmias

Contraindications

Severe heart disease or coronary artery disease
Uncontrolled high blood pressure
Hyperthyroidism (overactive thyroid)
Concurrent use of MAO inhibitors (risk of dangerous interactions)
Narrow-angle glaucoma
Pregnancy (especially the first trimester) and breastfeeding
Children under 12 years of age (depending on the product)

Drug Interactions

Pseudoephedrine can interact with various medications. Most importantly, combining it with MAO inhibitors can cause dangerous hypertensive crises. Antihypertensive drugs may also have reduced effectiveness when taken together with pseudoephedrine. Patients should always consult a doctor or pharmacist before use.

References

Björnsson GA, Haanaes HR, Skoglund LA. A randomized, double-blind crossover trial of nasal decongestants in pseudoephedrine and phenylephrine. European Journal of Clinical Pharmacology, 2003.
U.S. Food and Drug Administration (FDA): Drug Information on Pseudoephedrine. www.fda.gov
Katzung BG, Trevor AJ. Basic and Clinical Pharmacology, 15th Edition. McGraw-Hill Education, 2021.

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