 <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]  directs to swallow this medication whole, and to not break, crush, or chew the tablet before taking it. However, many similar drugs (immediate-release tablets) can be split, crushed, or chewed. Follow your doctor's directions on how to take this medication. If you vomit within 1 hour after taking your dose, ask your doctor if you should take another dose. No medication is completely effective in preventing the return of malaria. Malaria treatment works best when it is started early. Tell your doctor if your symptoms do not get better or if they get worse.The side effects of Krintafel Oral: Tafenoquine stays in your body a long time, so side effects may be delayed or last longer than expected. Trouble sleeping, anxiety, or nightmares 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 effects. Tell your doctor right away if you have any serious side effects, including: eye/vision problems. Get medical help right away if you have any very serious side effects, including: mental/ </s>