 <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]  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: severe mental/mood changes, severe drowsiness, loss of consciousness, slowed breathing.  Notes Do not share this medication with others. Lab and/or medical tests (such as phenytoin blood levels, liver function, complete blood count) should be done while you are taking this medication. Keep all medical and lab appointments. Consult your doctor for more details. Do not change from one brand of this product to another, or to another dose form of this drug (such as immediate release capsule, liquid suspension, or chewable tablet) without consulting your doctor or pharmacist. Your dosage may have to be adjusted.  Missed Dose If you miss your once daily dose, take it as soon as you remember. However, if you do not remember until the next day, skip the missed dose. Take your next dose at the regular time. If you take several doses daily and miss a dose, take it as soon as you remember unless it is within 4 hours of the next dose. In that case, skip the </s>