30 minutes to 1 hour before meals, taken with warm water. Traditionally swallowed as pills with plain boiled water (白汤).

Short-term use: typically 1-2 weeks for acute episodes of acid reflux, vomiting, or rib-side pain, then reassessed by a practitioner.

Avoid spicy, greasy, fried, and alcohol-rich foods, as these generate Heat and Dampness that worsen Liver Fire and Stomach disharmony. Sour foods (vinegar, citrus) should also be limited, as excessive sour flavor can aggravate acid reflux. Favor bland, lightly cooked vegetables, congee, and cooling foods such as mung beans, cucumber, and winter melon. Avoid eating late at night or overeating, which burdens the Stomach. Emotional calm during meals is important, as anger and frustration during eating directly aggravate the Liver-Stomach disharmony this formula treats.

Cytochrome P450 interactions (Huang Lian/berberine): Berberine, the primary alkaloid in Huang Lian (Coptis), has been shown in a clinical study to inhibit CYP2D6, CYP2C9, and CYP3A4 enzyme activities in humans. This means it may increase blood levels of drugs metabolized by these enzymes, including many antidepressants (e.g. venlafaxine, SSRIs), beta-blockers, warfarin, losartan, certain statins, benzodiazepines (e.g. midazolam), and immunosuppressants (e.g. cyclosporine). Patients on any medications metabolized by CYP2D6, CYP2C9, or CYP3A4 should exercise caution.

P-glycoprotein inhibition: Berberine inhibits P-glycoprotein (P-gp), a drug efflux transporter. This may increase absorption and blood levels of P-gp substrate drugs such as digoxin, certain statins, and some chemotherapy agents.

Hypoglycemic agents: Berberine has demonstrated blood glucose-lowering effects and may potentiate the action of insulin, metformin, or sulfonylureas, increasing hypoglycemia risk.

Anticoagulants: Due to CYP2C9 inhibition, concurrent use with warfarin may increase bleeding risk by raising warfarin plasma levels. INR should be monitored closely.