Ingredient-level reference
Ambroxol
Reference for: Ambroxol. Source presentation: IMMEDIATE-RELEASE ORAL FORM. Source route: oral.
The cited studies use standard-release immediate-release oral form. The catalogue entry has a different or unspecified release description; these study values do not establish its absorption profile.
Mechanism of action
Ambroxol is a bromhexine metabolite with secretolytic and secretomotor activity described in the oral-solution product information. Its full mechanism is not completely established. The separate HPRA lozenge reference also describes sodium-channel blockade in laboratory studies, a mechanism related to local anesthetic activity.
Pharmacokinetics
The oral-reference studies summarized by HPRA report peak plasma levels after approximately 1–2.5 hours for immediate-release ambroxol, protein binding of about 90% and a terminal half-life of about 10 hours. Metabolism occurs mainly in the liver, including glucuronidation and CYP3A4-mediated pathways. Lozenge, syrup and modified-release formulations can produce different exposure.
Ingredient-level summary of the cited reference product. Study formulation, route, strength and population govern interpretation; these data do not establish pharmacokinetics or bioequivalence for Walter's formulation or fixed combination.
Source: HPRA: Lysopadol ambroxol product information, with oral PK reference studies
EFDA: ambroxol oral-solution SmPC, pharmacodynamic properties
Reference accessed .
