 <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]  lenacapavir. It is very important to keep using this medication (and other HIV medications) exactly as prescribed by your doctor. Do not skip any doses. For the best effect, use this medication at evenly spaced times. To help you remember, mark your calendar to keep track of when to get the next dose. Do not stop using this drug (or other HIV medicines) even for a short time unless directed to do so by your doctor. Doing so may cause the amount of virus to increase, make the infection more difficult to treat (resistant).The side effects of Lenacapavir Subcutaneous: Injection site pain, swelling, redness, itching, bruising, or a hardened mass or lump may occur. Nausea may also occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. 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. As your immune system gets stronger, it can begin to fight off infections you already had, possibly causing disease symptoms to come back. You could also have symptoms if your immune system becomes overactive. This reaction may happen </s>