It is important for patients to share all relevant information with your urologist, as these may influence the result of the vasectomy. For example, be sure to communicate any known allergies or effects caused by common medications or topical anesthetics. It is also critical to address and questions or concerns during this preliminary stage so that patients can be well informed and educated about their procedure. Exact instructions will be given prior to arriving for your vasectomy. While these guidelines may vary, they generally include: Avoiding blood thinners, anti-inflammatories, or aspirin in the few days leading up to the procedure Eat a small, nutritious meal before the vasectomy to prevent lightheadedness or nausea that can occur after fasting for several hours Wearing an athletic supporter or tight fitting undergarments to support the treatment area after the vasectomy Shower before surgery to ensure the site is appropriately cleaned before the procedure You may also be asked to shave the genitals yourself, or this may be done in the office before the vasectomy begins Arrange to have a friend or family member help to care for you after the procedure is complete