Cinfatos

This medicine can impair cognitive function and can affect a patient's ability to drive safely. This class of medicine is in the list of drugs included in regulations under 5a of the Road Traffic Act 1988. When taking this medicine, patients should be told:

- The medicine is likely to affect your ability to drive

- Do not drive until you know how the medicine affects you

- It is an offence to drive while under the influence of this medicine

- However, you would not be committing an offence (called 'statutory defence') if:

o The medicine has been prescribed taken to treat a medical problem and

o You have taken it according to the information provided with the medicine and

o It was not affecting your ability to drive safely

Adverse effects are rare, however the following side effects may be associated with dextromethorphan hydrobromide:

Gastrointestinal Disorders

Rare: Gastrointestinal upset

Nervous System Disorders

Rare: Dizziness, drowsiness, mental confusion

Immune System Disorders

Hypersensitivity

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.

Symptoms:

These include nausea and vomiting, CNS depression, dizziness, dysarthria (slurred speech), myoclonus, nystagmus, somnolence (drowsiness), tremor, excitation, mental confusion, psychotic disorder (psychosis), and respiratory depression.

Management:

Treatment of overdose should be symptomatic and supportive. Gastric lavage may be of use. Naloxone has been used successfully as a specific antagonist to dextromethorphan toxicity in children.

Dextromethorphan hydrobromide is a cough suppressant which has a central action on the cough centre in the medulla. It has no analgesic properties and little sedative activity.

Dextromethorphan

Pharmacotherapeutic group: Cough suppressant

ATC code: R05DA09

Dextromethorphan hydrobromide is well absorbed from the gastrointestinal tract.

Dextromethorphan undergoes rapid and extensive first-pass metabolism in the liver after oral administration. Genetically controlled O-demethylation (CYD2D6) is the main determinant of dextromethorphan pharmacokinetics in human volunteers.

It appears that there are distinct phenotypes for this oxidation process resulting in highly variable pharmacokinetics between subjects. Unmetabolised dextromethorphan, together with the three demethylated morphinan metabolites dextrorphan (also known as 3-hydroxy-N-methylmorphinan), 3- hydroxymorphinan and 3-methoxymorphinan have been identified as conjugated products in the urine.

Dextrorphan, which also has antitussive action, is the main metabolite. In some individuals metabolism proceeds more slowly and unchanged dextromethorphan predominates in the blood and urine.

There is no relevant information additional to that already contained elsewhere in the SmPC or of relevance to the prescriber.

None stated.

No special requirements

ADMINISTRATIVE DATA