 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  man-made version of a natural substance found in goa powder, which is from the araroba tree. It works by decreasing inflammation and slowing down the growth of skin cells. How to use Zithranol Shampoo Read the Patient Information Leaflet if available from your pharmacist before you start using anthralin shampoo and each time you get a refill. If you have any questions, ask your doctor or pharmacist. This medication is for use on the scalp as directed by your doctor, usually 3 to 4 times a week. Wet hair, then massage anthralin shampoo onto scalp. Work into a gentle lather and leave on the scalp for 3 to 5 minutes. Rinse thoroughly with lukewarm water. Avoid contact with eyes. Although no additional shampoo is necessary to cleanse the hair, a non-medicated shampoo or conditioner can be applied after using anthralin shampoo, if desired. Use this product regularly to get the most benefit from it. Tell your doctor if your condition does not improve or if it worsens.The side effects of Zithranol Topical: Temporary redness or irritation of the treated scalp may occur. If either of these effects lasts or gets worse, tell your doctor or pharmacist promptly. Temporary </s>