
Cosac Soap
Written By Dr. Swati Mishra, BDS
Reviewed By Dr. Rajeev Sharma, MBA, MBBS
Last updated on 25 Feb 2026 | 03:58 PM (IST)
Cosac Soap has a combination of medicines that is used to treat psoriasis. It helps in softening of the skin.
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General Information
The content is shown in English



Product introduction
Cosac Soap should be used in the dose and duration as advised by your doctor. Wash your hands before using this medicine. It is advised to check the label for directions before use. It is for external use only.
Do not use this medicine more than the recommended dose. Inform your doctor if you have known allergies from this medicine. The common side effects of this medicine include redness, dry skin, and irritation at the application site.
If these side effects or any other symptoms which you think are because of this medicine persist for a longer duration, please consult your doctor. Inform your doctor if you are pregnant or are suffering from any other disease. This medicine is not safe to use in breastfeeding mothers.
Uses of Cosac Soap
Benefits of Cosac Soap
Psoriasis
Psoriasis is a skin problem in which skin cells build up and form scales and dry patches. Applying Cosac Soap helps manage psoriasis symptoms like itching, pain, redness, swelling or irritation. It moisturizes the skin and makes it soft and smooth. Cosac Soap is also an effective treatment for scalp psoriasis and reduces dryness, itchiness and scaling on the scalp. Follow the directions exactly until your condition improves which might take 8 weeks or more.
Psoriasis is a skin problem in which skin cells build up and form scales and dry patches. Applying Cosac Soap helps manage psoriasis symptoms like itching, pain, redness, swelling or irritation. It moisturizes the skin and makes it soft and smooth. Cosac Soap is also an effective treatment for scalp psoriasis and reduces dryness, itchiness and scaling on the scalp. Follow the directions exactly until your condition improves which might take 8 weeks or more.
Side effects of Cosac Soap
Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them
Common side effects of Cosac
- Application site irritation
How to use Cosac Soap
Use it as advised by your doctor or check the label for directions before use.
How Cosac Soap works
Cosac Soap consists of two medicines: coal tar and salicylic acid, both work together to treat psoriasis by addressing the underlying causes. Coal tar decreases skin cells' rapid proliferation, decreasing scaling and inflammation in psoriatic plaques. Salicylic acid plays a supporting role in the process by softening and dissolving the thick, scaly patches and enhancing skin texture. Combined, these agents can help lower the psoriasis symptoms, promote softer skin, and allow the skin’s natural repair process.
All substitutes for Cosac Soap
For information purposes only. Consult a doctor before taking any medicine.
Quick tips
- Cosac Soap is used to treat the redness, swelling, itching, and discomfort associated with psoriasis.
- It may take several weeks to show its action. Keep using it as suggested by your doctor.
- Wash your skin with a mild cleanser and pat it dry before applying Cosac Soap.
- Apply it as a thin layer onto a clean, dry, unbroken infected area of skin.
- Avoid contact with your eyes, nose, or mouth. Rinse it off with water if you accidentally get the cream in these areas.
- Don't cover the area being treated with airtight dressings such as bandages unless directed by a doctor, as this may increase the risk of side effects.
- After you have applied Cosac Soap, remember to wash your hands (unless your hands are the treated area).
- Use a mild moisturizer regularly to overcome skin dryness during the course of treatment.
Safety advice

Alcohol
No interaction found/established

Pregnancy
CONSULT YOUR DOCTOR
Information regarding the use of Cosac Soap during pregnancy is not available. Please consult your doctor.

Breast feeding
CONSULT YOUR DOCTOR
Information regarding the use of Cosac Soap during breastfeeding is not available. Please consult your doctor.

Driving
No interaction found/established

Kidney
No interaction found/established

Liver
No interaction found/established
Frequently asked questions
Cosac Soap is used to treat psoriasis. It helps to provide relief from redness, itching, and swelling. It removes dead skin cells and helps soften the skin.
Yes, salicylic acid and coal tar present in Cosac Soap act as keratolytic agents that break down and remove dead skin cells, softening rough patches.
The exact time Cosac Soap takes to see improvement is not known. However, you may notice some relief within a few days, but full benefits often take several weeks of regular use.
Yes, treated skin with Cosac Soap can be more sensitive to sunlight, so avoid sun exposure and use protective measures like sunscreen.
Coal tar present in Cosac Soap can stain fabrics, hair, and nails, so be careful during application to avoid unwanted staining.
If your skin condition does not improve or gets worse after Cosac Soap, stop using the medicine and consult your doctor for evaluation and alternative treatment options.
Fact Box
Habit Forming
No
Therapeutic Class
DERMA
References
- Salicylic Acid [EMC SmPC]. Huddersfield: Thornton & Ross Ltd.; 2018. [Accessed 03 Apr. 2019] (online) Available from:
- Innovative Pharma: Coal Tar & Salicylic Acid [Product Information]. [Accessed 14 Aug. 2024] (online) Availabe from:
- Memorial Sloan Kettering Cancer Center: Coal Tar and Salicylic Acid [Patient & Caregiver Education]. [Accessed 25 Feb. 2026] (online)
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Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.
Marketer details
Name: Yaher Pharma
Address: Old No 70/3 New No 201, Mettu Street, Ayanavaram, Chennai - 600023, Near Christian Assemble Church
Address: Old No 70/3 New No 201, Mettu Street, Ayanavaram, Chennai - 600023, Near Christian Assemble Church
Vendor Details
Country of origin: India
Lab tests offered by us
- CBC (Complete Blood Count)
- FBS (Fasting Blood Sugar)
- Thyroid Profile Total (T3, T4 & TSH)
- HbA1c (Glycosylated Hemoglobin)
- PPBS (Postprandial Blood Sugar)
- Lipid Profile
- Vitamin D (25-Hydroxy)
- Urine R/M (Urine Routine & Microscopy)
- Coronavirus Covid -19 test- RT PCR
- LFT (Liver Function Test)
- KFT (Kidney Function Test)
- TSH (Thyroid Stimulating Hormone) Ultrasensitive
- ESR (Erythrocyte Sedimentation Rate)
- Uric Acid, Serum
- Vitamin B12
- CRP (C-Reactive Protein), Quantitative
- Urine C/S (Urine Culture and Sensitivity)
- Serum Electrolytes
- Serum Calcium
- Serum Creatinine
- Diabetes Screening (HbA1C & Fasting Sugar)
- KFT with Electrolytes (Kidney Function Test with Electrolytes)
- Cholesterol - Total
- Hb (Hemoglobin)
- Complete Hemogram (CBC & ESR)
Why we need a prescription?
Provide right medicines
Prescriptions are complex documents. We proof read and recheck at various steps to provide you the right medication in the correct form and dose
In accordance with the law
Most medicines cannot be sold without a valid prescription, as per the Drugs and Cosmetics Act, 1940 and Rules, 1945















