 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  your doctor, especially when you first start treatment.The side effects of Vantas Implant: Irritation at the implant site (such as bruising, pain, redness), mood swings, or headache may occur. In men using this medication for prostate cancer, hot flashes (flushing), increased sweating, night sweats, tiredness, swelling of the ankles/feet, or constipation may occur. In girls using this medication for early puberty, breast tenderness or abnormal vaginal bleeding may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Rarely, breast tenderness/swelling may occur in men and boys as a result of lowered testosterone levels. Shrinking of the testicles and reduced sexual interest/ability may also occur in men. Talk to your doctor if these effects occur. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. If you are a man using this medication for prostate cancer, tell your doctor right away if you have any serious side effects, including: new/worsening bone pain, easily broken bones, increased thirst/urination, mental/ </s>