 <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]  someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center. Symptoms of overdose may include slow heartbeat, severe drowsiness, dizziness, confusion, muscle weakness, loss of consciousness.  Notes Lab and/or medical tests (such as magnesium blood levels, kidney function) should be done while you are taking this medication. Keep all medical and lab appointments. Consult your doctor for more details. Magnesium supplements are available in different forms with different amounts of magnesium. Many are available without a prescription. Ask your doctor or pharmacist for help in selecting the best product for you. Eat a well-balanced diet. Foods high in magnesium include avocados, bananas, beans, whole grain cereals, green vegetables, and nuts.  Missed Dose If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up.  Storage Store at room temperature away from light and </s>