There remains significant uncertainty whether bromhexine hydrochloride is more effective and safer than standard care in treating patients with COVID-19.
What is the evidence informing this recommendation?
Evidence comes from two randomised trials that compared bromhexine hydrochloride with placebo in 96 adults hospitalised with mild or moderate COVID-19 .
We have found one new study comparing bromhexine with standard care (Tolouian et al. J Investig Med doi: 10.1136/jim-2020-001747). This study is currently under review and an updated recommendation will be included in a future version of the guideline.
Study characteristics
In the study by Ansarin et al. mean age was 60 years and 45% were women ; in Li et al. mean age was 50 years and 22% were women . Patients in Ansarin et al. received 8 mg bromhexine hydrochloride three times a day for 14 days; patients in Li et al. received 32 mg three times a day for 14 days. Pregnant and breastfeeding women were ineligible.
What are the main results?
There were too few who died (five deaths) or suffered adverse events to determine whether bromhexine hydrochloride makes a difference. No patients experienced serious adverse events. It is unclear whether bromhexine hydrochloride increases or decreases time to clinical improvement or viral clearance by day 28.
Our confidence in the results
Certainty of the evidence is very low for all outcomes due to very serious risk of bias (lack of blinding of patients and outcome assessors) and very serious imprecision (low patient numbers, few events and wide confidence intervals).
For children & adolescents and pregnant & breastfeeding women, certainty is also downgraded for serious indirectness (absence or limited inclusion of these populations in the included studies).
Additional information
The safety profile for bromhexine hydrochloride indicates the following adverse effects: nausea, vomiting, diarrhoea and allergy (e.g. rash, urticaria, angioedema). Bromhexine hydrochloride has been associated with a low risk of severe skin reactions including erythema multiforme, Stevens-Johnson syndrome and acute generalised exanthematous pustulosis .