Benzydamine Hydrochloride: Effect on Sore Throat

Benzydamine hydrochloride is the water-soluble salt form of the active ingredient benzydamine. It is the galenic form used in nearly all commercial sprays, lozenges, and rinse solutions (brand names Tantum Verde and numerous generics). Pharmacologically, benzydamine hydrochloride works like benzydamine: locally anti-inflammatory, weakly local anesthetic, and mildly antiseptic on the oral and pharyngeal mucosa. Confusion with other salt forms such as benzydamine methanesulfonate is clinically rarely relevant. In everyday practice, benzydamine and benzydamine hydrochloride are used largely synonymously.

In Germany, sprays containing 0.15 percent benzydamine hydrochloride and lozenges with 3 mg per piece are available over the counter in pharmacies. They are used for acute and chronic inflammation of the oral and pharyngeal mucosa, such as sore throat in the context of colds, after dental procedures, or as adjunctive therapy for chemotherapy or radiation therapy-induced mucositis. Topical application minimizes systemic effects, which is why benzydamine hydrochloride is a practical option for self-medication.

Mechanism of Action

Benzydamine hydrochloride is a nonsteroidal agent with particular affinity for inflamed tissue. Unlike classical NSAIDs such as ibuprofen or diclofenac, it does not primarily inhibit cyclooxygenases but rather modulates membrane fluidity and lysosomal activity in inflammatory cells. The result is a reduction of inflammatory mediators such as prostaglandins, leukotrienes, and pro-inflammatory cytokines directly at the site of application.

Additionally, benzydamine hydrochloride acts as a local anesthetic through a weak membrane-stabilizing property on nerve fibers. This component explains rapid pain relief after application. The antibacterial activity against some streptococci and Candida is moderate and provides supportive effect, but does not replace antibiotic therapy for confirmed bacterial infections.

Pharmacokinetically, benzydamine hydrochloride is only minimally absorbed systemically after topical application. Plasma levels are low and clinically irrelevant. With rinse solutions, the active ingredient is subsequently spit out, which further reduces systemic exposure.

Areas of Use

• Acute throat inflammation (pharyngitis), especially with viral infections
• Tonsillitis as symptomatic adjunctive treatment, supplementing antibiotic therapy when bacterial in origin
• Aphthous ulcers and stomatitis in the oral cavity
• Postoperative mucosal inflammation after dental or maxillofacial surgical procedures
• Radiation or chemotherapy-induced mucositis as pain relief and anti-inflammatory measure
• Gingivitis with gum inflammation as adjuvant therapy
• Oral thrush and candidiasis supplementing specific antifungal agents

Benzydamine hydrochloride does not replace antibiotic therapy for bacterial infections such as streptococcal tonsillitis. For sore throat persisting for more than 5 to 7 days, high fever, or purulent coating, medical evaluation is required.

Dosage and Administration

Spray (0.15 percent): in adults, 4 to 8 sprays every 1.5 to 3 hours. In children between 6 and 12 years, 4 sprays every 1.5 to 3 hours, child-appropriate application.

Lozenges (3 mg): adults and children from 6 years, 1 lozenge every 1.5 to 3 hours, maximum 6 lozenges per day.

Rinse solution (0.15 percent): 15 ml undiluted in the mouth for 30 seconds, then spit out. 2 to 3 times daily.

Spray application technique: open mouth, direct spray to inflamed area, hold breath briefly, then avoid eating or drinking for 30 seconds.

Duration of therapy: for acute symptoms, usually maximum 7 days. For chronic or postoperative indications, longer duration based on medical recommendation.

Renal insufficiency and hepatic insufficiency: with topical application, dose adjustment usually not required because systemic absorption is low.

Children under 3 years: spray not recommended due to risk of accidental inhalation. Lozenges earliest from 6 years of age.

Side Effects

Common: brief burning or tingling in the oral cavity after application, temporary taste changes.

Occasional: dry mouth, mild mucosal irritation, sneezing, airway irritation with accidental spray inhalation.

Rare: allergic skin reactions, bronchospasm in very sensitive patients, Quincke's edema, Stevens-Johnson syndrome in very rare cases.

If swallowed: with smaller amounts usually harmless because systemic absorption is low. With larger amounts or in children, exercise caution and consult poison control if necessary.

Excipients: some products contain alcohol, peppermint oil, or sweeteners, which may cause local irritation or allergic reactions in certain patients.

Drug Interactions

• Other local oral therapeutics (antiseptics such as chlorhexidine, antifungals such as miconazole): maintain a gap of at least 30 minutes as effects or taste may be influenced.
• Toothpaste with lauryl sulfates: may cause additional mucosal irritation, particularly with aphthous ulcers or mucositis. Switch to SLS-free care products recommended.
• Systemic NSAIDs: no relevant interaction due to low absorption.
• Antibiotics: useful adjunctive treatment for bacterial tonsillitis, mutual interaction minimal.
• Topical glucocorticoids in the mouth: simultaneous application possible, but should be individualized.

Special Information

Pregnancy: due to low systemic absorption, topical application during pregnancy is generally acceptable. In the third trimester and perinatally, higher doses or oral rinse solution should be discussed individually. Breastfeeding: short-term application in the mouth is usually unproblematic because passage into breast milk is clinically not relevant.

Children: spray from 6 years of age, lozenges from 6 years of age. In small children, note the risk of aspiration. Parents should supervise application.

Before application: if bacterial tonsillitis is suspected (high fever, purulent coating, markedly enlarged lymph nodes), medical consultation is necessary. Self-medication without diagnosis can render unnecessary antibiotic therapy superfluous or delay necessary therapy.

Lifestyle with throat inflammation: drink adequate fluids (water, tea with honey), rest the voice, humidify room air, avoid smoke and cold air. Sucking on candies stimulates saliva flow and moistens the mucosa.

When to see a doctor: for sore throat lasting more than 7 days, high fever, difficulty swallowing, unilateral severe swelling, or shortness of breath. These signs may indicate a peritonsillar abscess or more serious infection.

Driving ability: not impaired by topical application.

You May Also Be Interested In

• Benzydamine, the pharmacological base text on the substance
• Tyrothricin, local polypeptide antibiotic for oral and throat inflammation
• Chlorhexidine, antiseptic oral rinse
• Povidone, another active ingredient in topical applications
• Dexamethasone, topical steroid for mucositis

Frequently Asked Questions

Sources

• Gelbe Liste, Benzydamine Active Ingredient Profile
• BfArM, Federal Institute for Drugs and Medical Devices
• AWMF, Guidelines for Pharyngitis and Tonsillitis
• EMA, European Medicines Agency