Tecentriq Injection belongs to a group of medicines called monoclonal antibodies. It is used in the treatment of non-small cell lung cancer, small cell lung cancer, hepatocellular carcinoma, and melanoma. Tecentriq Injection is given as an injection into veins under the supervision of a doctor. Your doctor will decide what dose is necessary and how often you need to take it. This will depend on what you are being treated for and may change from time to time. You should take it exactly as your doctor has advised. Taking it in the wrong way or taking too much can cause very serious side effects. It may take several weeks or months for you to see or feel the benefits but do not stop taking it unless your doctor tells you to. The most common side effects of this medicine include fatigue, nausea, decreased appetite, constipation, cough, and shortness of breath. Some side effects such as chest pain, diarrhea, and dark urine might require immediate action. Inform your doctor if it bothers you, as there may be a way to prevent the side effects. Before taking it, tell your doctor if have heart disease, liver, or kidney problems or are taking any medicines to treat infections. Many other medicines can affect, or be affected by, this medicine so let your healthcare team know all medications you are using. This medicine is not recommended during pregnancy or while breastfeeding. Use of effective contraception by both males and females during treatment is important to avoid pregnancy. "There is a Patient Support Program / Patient Assistance Program available in India for this medicine, being managed by Tata 1mg. Please contact your prescribing doctor to know more about the same. You may also call on (1800-102-1618) for more details."