Erlotec 100mg Tablet is utilized in the treatment of non-small cell lung cancer and pancreatic cancer. Erlotec 100mg Tablet should be taken on an empty stomach or should be taken one hour before or 2 hour after meal. You should continue to take it as long as your doctor advises it. The duration of treatment varies according to your needs and response to treatment. 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 medication include nausea, vomiting, fatigue, rash, and weight loss. It may cause severe diarrhea, drink plenty of fluids or consult with your doctor if it bothers you. It makes you sensitive towards sunlight, hence wear protective clothing or use sunscreen while going out. In case you develop ulceration in mouth, changes in your vision, or breathing difficulties than it is better to inform the doctor. Your doctor may advise for regular monitoring of liver function while you are taking this medication.