Mediker shampoo is an anti-lice treatment shampoo that contains Phenothrin, an insecticide from the pyrethroid family, which is useful in killing ticks, fleas, and lice. The shampoo also contains coconut oil, neem, and camphor. According to the product details on Amazon, Mediker has been clinically tested and proven to be completely safe to use, with no side-effects. However, the use of Mediker Liquid at a high dose may lead to some side effects such as abnormal endocrine system/thyroid hormone signaling and weakening of the immune system. It is important to note that the product may contain inactive ingredients that can cause allergic reactions or other problems, so it is recommended to talk to a pharmacist for more details.