This information is intended for use by health professionals

1. Name of the medicinal product


2. Qualitative and quantitative composition

Distilled Coal Tar 40.0% w/v.

3. Pharmaceutical form

Bath additive. Buff coloured liquid emulsion.

4. Clinical particulars
4.1 Therapeutic indications

For use topically as an aid in the treatment of sub-acute and chronic psoriasis.

4.2 Posology and method of administration

For adults, children and the elderly. Add 30 ml of the emulsion to a standard bath of warm water. Soak for 5 minutes, pat dry.

4.3 Contraindications

Not to be used for acute, sore or pustular psoriasis or in the presence of infection.

Not to be used in cases of sensitivity to any of the ingredients.

4.4 Special warnings and precautions for use

Do not use product undiluted. Keep away from the eyes and broken or inflamed skin. Replace cap after use. Avoid spillage.

4.5 Interaction with other medicinal products and other forms of interaction

None known.

4.6 Pregnancy and lactation

No special precautions.

4.7 Effects on ability to drive and use machines

None known.

4.8 Undesirable effects

Local side-effects do not normally occur. In rare cases of skin irritation, acne-like eruptions or photosensitivity, discontinue treatment. Rarely, Psoriderm Bath Additive may stain skin, hair or fabric.

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:

4.9 Overdose

There are no known toxic effects resulting from excessive use of Psoriderm Bath Additive. If accidentally swallowed, patients should contact a doctor or hospital immediately.

5. Pharmacological properties
5.1 Pharmacodynamic properties

Coal tar has been used dermatologically for hundreds of years and has been shown to be safe and effective in the treatment of scaly skin conditions such as psoriasis. The British Pharmacopoeia contains monographs on coal tar and coal tar solution, and many formulations of coal tar are used in hospitals throughout the country. The coal tar used in Psoriderm Bath Additive has been specially distilled and is based on a neutral fraction which has been shown to be effective in the treatment of psoriasis.

The precise mechanism of action of coal tar is not understood, largely as a result of it comprising up to 10,000 components. There is evidence that topical application of coal tar improves psoriasis by reducing the excessive rate of mitotic epidermal cell division.

5.2 Pharmacokinetic properties

Dry scales, which are a common feature of psoriasis, generally reduce the effectiveness of topically applied treatments by reducing absorption of the active ingredient. An established means of overcoming this problem is to add a mild softening agent such as lecithin. In the case of Psoriderm Bath Additive, however, no such softening agent is included because the dosage and administration regime involves prolonged soaking (5 minutes) in a warm water emulsion which achieves a similar effect.

5.3 Preclinical safety data


6. Pharmaceutical particulars
6.1 List of excipients

Polysorbate 20; Trolamine; Phenoxyethanol; Water.

6.2 Incompatibilities

None known.

6.3 Shelf life

36 months.

6.4 Special precautions for storage

Do not store above 25°C.

6.5 Nature and contents of container

Amber glass bottle containing 200 ml. This is supplied as an original pack (OP).

6.6 Special precautions for disposal and other handling

Not applicable.

7. Marketing authorisation holder

Dermal Laboratories

Tatmore Place, Gosmore

Hitchin, Herts SG4 7QR, UK.

8. Marketing authorisation number(s)


9. Date of first authorisation/renewal of the authorisation

4 January 2007.

10. Date of revision of the text

February 2015.