Benzydamine hydrochloride
Brand names: Difflam, Difflam-C (with chlorhexidine)
Benzydamine hydrochloride is a topically acting analgesic and anti-inflammatory agent used as a mouthwash or spray for painful inflammatory conditions of the mouth and throat.
ClinCalc Pro is rebuilding its dose data from primary open sources — the manufacturer SmPC (eMC), the WHO Model Formulary and other official references — under clinician review. This drug's structured dose is not yet published here. Confirm all doses against the product SmPC and your local formulary before prescribing.
Clinical monograph
How it works
It is a non-steroidal agent with local analgesic and anti-inflammatory effects, and also exerts a local anaesthetic and mild antiseptic action on inflamed mucosa.
Prescribing in practice
- It is for local oropharyngeal use only and patients should be advised that stinging or numbness of the mouth may occur on application.
- The mouthwash may be diluted with water if it causes stinging, particularly in ulcerated mucosa.
- It is useful for mucositis-related pain but provides symptomatic relief rather than treating the underlying cause.
Monitoring
No specific monitoring is required; assess symptomatic relief and local tolerability.
Counselling the patient
- Use the mouthwash or spray for symptom relief and do not swallow large amounts.
- Dilute the mouthwash with water if it stings.
- Seek advice if mouth or throat symptoms persist.
Evidence & guidelines
Topical benzydamine is a recognised option for symptomatic relief of oral mucositis and oropharyngeal inflammation.
Reference: SmPC Difflam; NICE CKS Mouth Ulcers; NCI/MASCC Mucositis Guidelines; Drug verified in RxNorm (NLM); confirm dosing against the manufacturer SPC (eMC). Verify against your local formulary and current prescribing references before prescribing. Monograph status: clinician-reviewed (2026-07-04).
Related
Curated clinical cross-links plus same-class fallbacks.
- Adult Upper Airway Obstruction (Stridor) · DAS 2015 unanticipated difficult airway; RCEM
- Epistaxis Management · ENT-UK / NICE
- Acute Otitis Media · NICE NG91 2018
- Tonsillitis and Sore Throat · NICE NG84 2018
- Benign Paroxysmal Positional Vertigo · NICE CG124 / AAO-HNS Guidelines
- Acute Rhinosinusitis · NICE NG79 2017 / EPOS 2020