For liquid Pepto-Bismol (original strength), the typical dose for adults and children 12 years and older is 30 mL every 30 to 60 minutes as needed. You should not take more than 8 doses (240 mL) in 24 hours. It is recommended not to use Pepto-Bismol for more than 2 days. If symptoms persist beyond 2 days, consult a doctor. The liquid should be shaken before use, and the dosing cup that comes with the product should be used to measure the dose accurately. Children under 12 should consult a doctor before use, and different doses apply for younger children.