Psychopharmacology and Psychiatry Updates Lithium: GI and Weight Side Effect Management
Apr 6, 2026
David Osser, Associate Professor of Psychiatry at Harvard Medical School and psychopharmacology expert, shares clinical strategies for managing lithium-related weight and GI problems. He discusses causes of weight gain, thirst and beverage swaps, water retention and diuretics, thyroid monitoring, craving-driven eating, and practical tips for nausea, diarrhea, and formulation choices.
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Maria Case Illustrates Real World Lithium Side Effects
- Maria is a 34-year-old with bipolar I on lithium 4 months who gained 12 pounds and has bloating plus intermittent diarrhea.
- She questions whether to stop lithium despite mood stability, illustrating common clinical dilemmas.
Proactively Discuss Four Lithium Weight Gain Drivers
- Discuss four lithium weight gain drivers proactively with patients before starting treatment.
- Ask about drinks, thirst habits, thyroid monitoring, and carbohydrate cravings to prevent early and late weight gain.
Switch Thirst Drinks To Low Calorie Electrolytes
- Avoid caloric beverages for lithium-related polydipsia and encourage water or low-calorie electrolyte drinks.
- Recommend sports-type low-calorie solute-replacing drinks to replenish minerals without adding calories.