It is recommended that you also refer to as the Summary of Product Characteristics may have been updated since this copy was printed.

Pfizer Consumer Healthcare

Pfizer Consumer Healthcare

Summary of Product Characteristics last updated on 4/1/2017

Robitussin Dry Cough


Robitussin Dry Cough 7.5 mg / 5ml Oral Solution


Each 5 ml of liquid contains;

Active ingredient:

Dextromethorphan Hydrobromide

7.5 mg


Ethanol (96%)

98 mg


0.165 mg

Liquid Maltitol

242 mg

Sorbitol Solution 70%

1.454 g

For a full list of ingredients, see 6.1


Oral Solution

A clear, red liquid with the characteristic odour and taste of cherry / grenadine


4.1 Therapeutic indications

As a cough suppressant for the relief of non-productive irritant cough

4.2 Posology and method of administration

Taken orally

Adults and children over 12 years:

10 ml 3 to 4 times daily

Children under 12 years:

Do not use

4.3 Contraindications

Use in children under 12 years of age.

Use in patients taking a prescription monoamine oxidase inhibitor (MAOI), a selective serotonin reuptake inhibitor (SSRI), or for 2 weeks after stopping the medication. (see section 4.5). Severe and sometimes fatal reactions have been reported after use of dextromethorphan in patients receiving MAOIs.

Hypersensitivity to the active substance or to any of the excipients.

4.4 Special warnings and precautions for use

Robitussin Dry Cough should only be used under medical supervision for persistent or chronic cough such as occurs with smoking, asthma or emphysema, or where the cough is accompanied by excessive secretions.

Cases of dextromethorphan abuse have been reported. Caution is particularly recommended for adolescents and young adults as well as in patients with a history of drug abuse or psychoactive substances.

Dextromethorphan is metabolised by hepatic cytochrome P450 2D6. The activity of this enzyme is genetically determined. About 10% of the general population are poor metabolisers of CYP2D6. Poor metabolisers and patients with concomitant use of CYP2D6 inhibitors may experience exaggerated and/or prolonged effects of dextromethorphan. Caution should therefore be exercised in patients who are slow metabolizers of CYP2D6 or use CYP2D6 inhibitors (see also section 4.5).

If the product is abused by patients they may become dependent on it.

Patients who are taking other medication and/or are under the care of a physician, should consult their doctor before taking the product.

There have been no specific studies of Robitussin Dry Cough in renal or hepatic dysfunction. Due to the extensive hepatic metabolism of dextromethorphan, caution should be exercised in the presence of hepatic impairment.

Do not exceed the recommended dose.

If symptoms persist for more than 7 days, you have a recurrent cough or is accompanied by fever, rash or persistent headaches, consult your doctor or pharmacist. These could be signs of a serious condition.

This medicinal product contains 2.5% v/v ethanol (alcohol), up to 196 mg per dose, (equivalent to approx 1.6 ml wine per dose). Harmful for those suffering from alcoholism. To be taken into account in pregnant or breast-feeding women and high-risk groups such as patients with liver disease, or epilepsy.

This product contains amaranth (E123) which may cause allergic reactions.

Patients with rare hereditary problems of fructose intolerance should not take this medicine.

Keep out of the sight and reach of children.

4.5 Interaction with other medicinal products and other forms of interaction


Fluoxetine / Paroxetine: Hallucinations and serotonin syndrome may occur.


Do not give to patients taking a a prescription monoamine oxidase inhibitor (MAOI), a selective serotonin reuptake inhibitor (SSRI), or for 2 weeks after stopping the medication. Concomitant use of dextromethorphan with an MAOI drug is contraindicated as it can result in serotonin syndrome, with symptoms including hypertension, hyperpyrexia, arrhythmia or myoclonus. Severe and sometimes fatal reactions have been reported after use of dextromethorphan in patients receiving MAOIs.

The pharmacological mechanism for the interaction may be that of 1) dextromethorphan blocking the neuronal reuptake of serotonin, and 2) MAOI drug decreasing the breakdown of serotonin.


Quinodine and Amiodarone can increase the concentration of Dextromethorphan.


Linezolid: Serotonin like symptoms have occurred when Dextromethorphan has been taken with Linezolid.

CYP2D6 inhibitors

Dextromethorphan is metabolized by CYP2D6 and has an extensive first-pass metabolism. Concomitant use of potent CYP2D6 enzyme inhibitors can increase the dextromethorphan concentrations in the body to levels multifold higher than normal. This increases the patient's risk for toxic effects of dextromethorphan (agitation, confusion, tremor, insomnia, diarrhoea and respiratory depression) and development of serotonin syndrome. Potent CYP2D6 enzyme inhibitors include fluoxetine, paroxetine, quinidine and terbinafine. In concomitant use with quinidine, plasma concentrations of dextromethorphan have increased up to 20-fold, which has increased the CNS adverse effects of the agent. Amiodarone, flecainide and propafenone, sertraline, bupropion, methadone, cinacalcet, haloperidol, perphenazine and thioridazine also have similar effects on the metabolism of dextromethorphan. If concomitant use of CYP2D6 inhibitors and dextromethorphan is necessary, the patient should be monitored and the dextromethorphan dose may need to be reduced.

4.6 Fertility, pregnancy and lactation

Although Dextromethorphan has been in widespread use for many years without apparent ill effect, the safe use of this product in pregnancy has not been established.

It is not known whether dextromethorphan or its metabolites are excreted in human milk. Caution should therefore be exercised by balancing the potential benefit of treatment against any possible hazards. This product should only be taken by breast-feeding mothers when considered essential by the physician.

4.7 Effects on ability to drive and use machines

Dextromethorphan hydrobromide has no or negligible influence on the ability to drive and use machines.

4.8 Undesirable effects

The following side effects may be associated with the use of Dextromethorphan although the frequency is not known (cannot be estimated from available data):

Immune system disorders

Hypersensitivity reactions

Nervous system disorders


Gastrointestinal disorders

Gastrointestinal upset

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 HPRA Pharmacovigilance, Earlsfort Terrace, IRL - Dublin 2, Tel: +353 1 6764971, Fax: +353 1 6762517 Website:


4.9 Overdose

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.

Gastric lavage and supportive measures should be used.


5.1 Pharmacodynamic properties

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.

ATC code: R05DA09

5.2 Pharmacokinetic properties

Dextromethorphan hydrobromide is well absorbed from the GI 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.

5.3 Preclinical safety data

Not applicable


6.1 List of excipients


Croscarmellose Sodium

Sodium Benzoate (E211)

Disodium Edetate

Maltitol Liquid

Citric Acid Anhydrous

Amaranth (E123)

Caramel (E150)


Cherry / Grenadine Flavour

Sorbitol Solution (70%) (E420)

Sodium Cyclamate

Acesulfame Potassium Salt

Purified Water

Ethanol (96% v/v)

6.2 Incompatibilities

Not Applicable

6.3 Shelf life

PET Bottles: 3 years

6.4 Special precautions for storage

Do not store above 25°C

6.5 Nature and contents of container

PET bottles containing 100ml with PET-lined PP/HDPE child resistant screw caps.

A clear polypropylene measuring cup is also included.

6.6 Special precautions for disposal and other handling

No special requirements


Pfizer Healthcare Ireland,

9 Riverwalk, National Digital Park,

Citywest Business Campus, Dublin 24.


PA 822/172/1


Date of first authorisation: 18th December 1985

Date of last renewal: 18th December 2010


December 2016

It is recommended that you also refer to as the Summary of Product Characteristics may have been updated since this copy was printed.