Introduction
Coal tar solution is a topical treatment used primarily in dermatology for its therapeutic effects on various skin conditions. It is derived from coal tar and has been used for over a century in the management of psoriasis, eczema, and other inflammatory skin disorders.
Uses
Coal tar solution is used for:
- Treatment of psoriasis
- Management of eczema
- Relief from seborrheic dermatitis
- Alleviation of itching and scaling associated with these skin conditions
Mechanism of Action
Coal tar solution works through its antipruritic and anti-inflammatory properties. It helps to:
- Reduce the rate of skin cell proliferation, which helps to alleviate scaling and plaque formation
- Soften and remove thickened skin
- Decrease inflammation and itching by modulating immune responses
How Long Does It Take to Work?
The therapeutic effects of coal tar solution can generally be observed within 1 to 2 weeks of regular application. However, full benefits may take several weeks, depending on the severity of the condition and adherence to the treatment regimen.
Absorption
When applied topically, coal tar is minimally absorbed into the systemic circulation. It acts locally at the site of application with minimal systemic effects, which helps reduce the risk of widespread side effects.
Route of Elimination
Coal tar and its metabolites are primarily excreted through the skin and in the feces. Minimal amounts may be found in the urine.
Dosage
Polytar Scalp Shampoo should be used by adults and children over the age of 12, once or twice per week for an initial period of 4 weeks.First, wet your hair and then massage a small amount of the shampoo into the scalp and any affected areas nearby, using the fingertips. After it has lathered, rinse the scalp well. Repeat this process, ensuring that the shampoo is in contact with scalp for around 3-5 minutes in total over the two applications.
For use for longer than a period of 4 weeks, consult a doctor and use as directed.
The dosage and frequency of application depend on the specific condition being treated. Generally:
- Apply a thin layer of coal tar solution to the affected areas once or twice daily.
- It may be used in combination with other topical treatments as directed by a healthcare provider.
Administration
Coal tar solution is applied topically. It should be spread evenly over the affected skin areas. It is important to follow the instructions provided with the product or as prescribed by a healthcare provider.
Side Effects
- Skin irritation or redness
- Dryness or peeling of the skin
- Unpleasant odor
- Photosensitivity (increased sensitivity to sunlight)
Toxicity
Toxicity is rare when coal tar solution is used as directed. However, excessive or prolonged use can lead to increased skin irritation or systemic effects. In case of severe reactions, discontinue use and consult a healthcare provider.
Precautions
- Avoid contact with eyes and mucous membranes. - Do not apply to open wounds or broken skin. - Use with caution in individuals with sensitive skin or those prone to allergic reactions.
Interaction
Coal tar solution may interact with other topical treatments. Avoid using it simultaneously with other topical therapies unless directed by a healthcare provider.
Disease Interaction
Use coal tar solution cautiously in individuals with:
- Skin infections or open wounds
- Severe skin conditions requiring systemic treatment
Drug Interaction
There are no known significant drug interactions with coal tar solution. However, consult a healthcare provider if using other medications or topical treatments.
Food Interactions
There are no known food interactions with coal tar solution. It does not typically affect or be affected by dietary intake.
Pregnancy Use
Coal tar solution is classified as Category C for pregnancy. Its safety during pregnancy has not been established. Use only if the potential benefits outweigh the risks and consult a healthcare provider.
Lactation Use
It is not known if coal tar is excreted in breast milk. Caution is advised when using it during breastfeeding, and consult a healthcare provider before use.
Acute Overdose
Acute overdose is unlikely with topical application. If a large amount is accidentally ingested or applied, seek medical attention immediately to manage potential adverse effects.
Contraindication
Coal tar solution is contraindicated in individuals with:
- Known hypersensitivity to coal tar or any of its components
- Active skin infections in the area to be treated
Use Direction
Follow the instructions provided with the product or as prescribed by a healthcare provider. Apply to clean, dry skin, and avoid contact with eyes and mucous membranes.
Storage Conditions
Store coal tar solution at room temperature, away from direct sunlight and moisture. Keep out of reach of children.
Volume of Distribution
The volume of distribution for coal tar solution is not well-documented, as it is primarily localized to the site of application with minimal systemic absorption.
Half Life
The half-life of coal tar when used topically is not well-defined due to minimal systemic absorption. Its effects persist locally at the site of application.
Clearance
Coal tar is primarily cleared through the skin and feces. Minimal amounts are excreted in the urine.
