Between meals, served cold (traditionally cooled by immersing the decoction vessel in cold water before drinking). Two doses taken in succession, without regard to a specific time of day.

Acute use: 1-3 days, rarely exceeding 5 days. This is a short-term formula for acute summer illness, not intended for prolonged administration.

While taking this formula, avoid cold and raw foods, iced drinks, and greasy or heavy meals, as these aggravate the internal Dampness that the formula is designed to resolve. Dairy products and excessively sweet foods should also be limited since sweetness can generate Dampness. Light, warm, easily digestible foods such as plain rice porridge (congee), cooked vegetables, and mild soups are ideal. Small amounts of fresh ginger in food can complement the formula's warming action. Avoid alcohol beyond the small amount traditionally added during preparation.

No significant drug interactions have been documented for the three herbs in Xiang Ru San at standard therapeutic doses. However, the following theoretical considerations apply:

• Hou Po (Magnolia Bark) contains magnolol and honokiol, which have mild sedative and muscle-relaxant properties. There is a theoretical potential for additive effects when combined with central nervous system depressants (benzodiazepines, barbiturates, or sedative antihistamines).
• The formula's diaphoretic (sweat-promoting) action may cause mild fluid and electrolyte shifts. Patients taking diuretics or antihypertensives should be aware of possible additive effects on blood pressure or hydration status.
• Xiang Ru's essential oils have demonstrated mild antimicrobial activity in laboratory studies. While clinically insignificant in most cases, concurrent use with antibiotics for gastrointestinal infections should be coordinated with the prescribing physician.