 <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] . If using a needle-free device, your skin should be clean and dry before injecting. This medication should never be injected directly into a vein (IV) or into a muscle (IM). Also, never inject this medication through clothing. If there is no improvement in your symptoms, do not take any more doses of this medication before talking to your doctor. If your symptoms are only partly relieved, or if your headache comes back, you may use a second injection after one hour or as directed by your doctor. Do not use more than 12 milligrams in a 24-hour period. Do not reuse the syringe or the needle-free device. Check the instructions on your auto-injector device to see if it may be re-used. If your symptoms are only partly relieved or your headache returns, 2 hours after the injection you may switch to sumatriptan taken by mouth instead of using a second injection. After the initial injection you may take sumatriptan by mouth every 2 hours if needed to a maximum of 100 milligrams of tablets in a 24-hour period. If you have never taken this medication before and you have risk factors for heart disease (see Precautions), you may need to be monitored for rare but serious side effects </s>