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The starting dose for metoclopramide is typically 10 mg taken every 8 hours for the treatment of conditions such as nausea and gastroparesis. This dosing regimen allows for adequate therapeutic levels to be reached while balancing efficacy and potential side effects.

Metoclopramide is used to enhance gastrointestinal motility, making it especially useful in managing symptoms associated with certain conditions. The choice of a starting dose takes into account the drug's pharmacokinetics and the need for effective symptom management in various patient populations.

Other dosages, such as 5 mg every 6 hours or 15 mg every 12 hours, may not provide the optimal therapeutic effect as the recommended starting dose allows for a steady state that maximizes benefits and minimizes risks of adverse reactions. The option of 20 mg every 24 hours would indicate a much lower frequency of administration, which could compromise symptom control in the appropriate clinical context.