Your doctor should check your progress at regular visits to make sure that the medicine is working properly and to check for unwanted effects.
Tretinoin causes fever, headache, tiredness, and weakness in most people who take it. It is very important that you continue taking the medicine even if it makes you feel ill. Your health care professional may be able to suggest ways to relieve some of these effects. However, if you develop a very severe headache or a headache that occurs together with nausea, vomiting, or vision problems, check with your doctor right away.
Tretinoin sometimes causes a severe reaction that affects the lungs at first, but can later spread to other parts of the body. Signs of this reaction include breathing problems, bone pain, chest pain, and fever. Check with your doctor right away if any of these effects occur during treatment .