Avastin, the brand name form of bevacizumab, is a prescription medication used to treat various types of cancer. Avastin belongs to a group of drugs called anti-angiogenic agents, which stop the tumor from spreading through the body. This medication is available in an injectable form to be given directly into a vein by a healthcare professional. Common side effects of Avastin include nosebleeds, headache, and high blood pressure. For more information on this medication and all other medications, explore the RxWiki encyclopedia on the web or on your mobile device.