Acute gastroenteritis in a traveller: choosing between three closely matching remedies

The stool alone does not decide the remedy; the modalities and the generals do.

• Arsenicum album fits the particular modalities (burning better by warmth), the thirst (small, frequent sips), the mental state (restlessness with anxiety and prostration out of proportion to the physical loss) and the generals (cold sweat on the forehead, dry tongue).
• Veratrum album also produces profuse vomiting, diarrhoea, cold sweat and collapse, but typically with thirst for large quantities, cramps, and cold sweat over the whole body; burning relieved by heat and small-sip thirst argue against it.
• Podophyllum gives profuse, gushing, offensive stools, often painless and worse in the early morning, with thirst for large amounts; the restlessness and burning > warmth are not characteristic.

Prescription: Arsenicum album 30C, one dose, repeated every 2–3 hours only while symptoms are active and improvement has stopped; reduce the frequency as he improves and stop when clearly better. The 30C suits an acute case with a clear totality and high susceptibility; a 6C would be preferred in an unusually sensitive patient, and a 200C only if the 30C acts well but the effect fades within hours. Unnecessary repetition once improvement has begun is the commonest error (Organon §246).

Present findings needing action now: nine stools in 6 hours, four vomits, dry tongue, pulse 104, systolic BP 100, and no urine for 9 hours with dark urine together indicate at least moderate dehydration. Homoeopathy is given alongside oral rehydration, not instead of it. He should start small frequent volumes of ORS (5–10 mL every 2–3 minutes if vomiting), be weighed if possible, and be reviewed within 4–6 hours.

Referral triggers (any one):

• blood or mucus in stool, or fever above 39 °C with rigors;
• persistent vomiting so that no oral fluid is retained for more than 2 hours;
• falling urine output beyond 12 hours, drowsiness, confusion, sunken eyes, or a systolic BP below 90;
• severe abdominal pain with guarding, or pain that localises to the right iliac fossa;
• no objective improvement after 6–8 hours of correct treatment.

Reasoning: the decision is not "which remedy" but "is this a self-limiting acute episode safely managed at home". Red-flag features shift the setting of care, not the potency. Documenting the review time and the return criteria is part of the prescription.

Frame the advice around risk, not reassurance.

1. Fitness to fly: he should not board if he is still vomiting, has not passed urine, or is dizzy on standing at the time of departure. A fit-to-fly assessment on the day is reasonable; airlines can refuse a visibly unwell passenger.
2. Hydration plan: continue ORS in small frequent volumes through the journey; avoid alcohol and caffeine; carry an isotonic drink; request an aisle seat for toilet access.
3. Immobility risk: dehydration plus a long seated flight increases venous thrombosis risk; advise calf exercises, compression stockings if available, and walking when permitted.
4. Medication handling: give the remedy dose before leaving for the airport and keep it in hand luggage; do not repeat it prophylactically if he is well.
5. Safety net: give written red flags and advise medical review at the destination if symptoms recur.

Reasoning: a prescription is part of a management plan; the correct remedy does not make an unfit patient fit to fly, and a 20-hour deadline should not be allowed to override dehydration assessment.