Can you drink coffee while on lithium Take Lithium With Food Pure Sports Nutrition Race Energy Gel + Caffeine – Run Havoc Lithium Medication Dietary Guide Caffeine • The Nutrition Source Sudden Reduction in Caffeine Intake Increases Serum Lithium Concentration to Supratherapeutic Level: A Case Report Lithium tremor worsened in two patients when caffeine (coffee) was eliminated from their diets.