 <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]  product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.The uses of Tofersen Intrathecal: Tofersen is used to treat a certain type of nerve disease called amyotrophic lateral sclerosis (ALS, also commonly called Lou Gehrig's disease). How to use Tofersen 100 Mg/15 Ml (6.7 Mg/Ml) Intrathecal Solution This medication is given by injection into the spine (intrathecal) by a health care professional. It is given as directed by your doctor, usually once every 2 weeks for the first 3 doses and then once every 4 weeks. Use this medication regularly to get the most benefit from it. To help you remember, mark the days on a calendar you need to receive this medication. Tell your doctor if your condition gets worse.The side effects of Tofersen Intrathecal: Joint pain, muscle pain, or tiredness may 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 </s>