Dehydration in Spain: Signs, Treatment & When to Call a Doctor

9 May 2026by OnCall Clinic3 min read

How to prevent and treat dehydration on holiday in Spain. When ORS from the pharmacy is enough and when you need IV fluids from a doctor.

Dehydration on Holiday in Spain: What Every Tourist Should Know

Spain's summer heat regularly exceeds 40°C in southern and island destinations. Combined with alcohol, physical activity, and forgetting to drink water, dehydration is one of the most common medical issues tourists face — and one of the most preventable.

Why Tourists Get Dehydrated in Spain

The combination hits harder than people expect. Flying dehydrates you before you even land. Airport and beach drinks are often alcoholic. Air conditioning masks how much you're sweating. And many visitors underestimate Spanish summer heat, especially in Ibiza, Marbella, Tenerife, and the Costa del Sol where temperatures stay high well into the evening.

Children and elderly travellers are at higher risk, as are anyone with a stomach bug (vomiting and diarrhoea accelerate fluid loss dramatically).

First Steps: What to Do

Mild dehydration (thirsty, slightly tired, darker urine):

  • Drink water steadily — small sips, not gulping
  • Add electrolytes: pharmacy ORS sachets (€3-5, no prescription) or diluted fruit juice with a pinch of salt
  • Move to shade or air conditioning
  • Avoid alcohol and caffeine until recovered

Pharmacy options (no prescription needed):

  • Sueroral or generic suero oral (ORS sachets) — €3-5
  • Aquarius (sports drink, widely available) — not ideal but better than nothing
  • Ibuprofen if headache accompanies dehydration

When a Pharmacy Isn't Enough

If someone cannot keep fluids down, hasn't urinated in 8+ hours, feels dizzy standing up, or shows confusion, they may need IV fluids. This is especially true for children under 5 and elderly travellers.

Your options:

  1. Public ER (Urgencias): Free with EHIC/GHIC. Wait times 2-4 hours. Ask for "suero intravenoso."
  2. Home doctor visit: OnCall Clinic sends a doctor to your accommodation within 1-2 hours. The doctor can administer IV fluids on-site. €150, card payment, insurance invoice provided.
  3. Call 112 if the person is confused, unconscious, or having seizures — this is a medical emergency.

Prevention Tips for Your Holiday

  • Carry a water bottle everywhere (refill at restaurants — tap water is safe in most of Spain)
  • Drink before you feel thirsty — if you're thirsty, you're already mildly dehydrated
  • Match every alcoholic drink with a glass of water
  • Avoid heavy outdoor activity between 12:00-16:00
  • Watch children closely — they dehydrate faster and may not complain
  • Pack ORS sachets from home or buy at any Spanish pharmacy on arrival

Nearest Hospitals by Region

  • Ibiza: Hospital Can Misses (Eivissa) — 24h ER
  • Mallorca: Hospital Son Espases (Palma) — 24h ER
  • Marbella: Hospital Costa del Sol (Marbella) — 24h ER
  • Tenerife: Hospital Universitario de Canarias (La Laguna) — 24h ER

Book a Home Doctor Visit

If someone in your group is dehydrated and can't keep fluids down, a home doctor can assess and treat at your accommodation. Book at oncall.clinic — doctor arrives in 1-2 hours, €150, card payment, insurance invoice.

Frequently asked questions

Can I buy oral rehydration salts without a prescription in Spain?
Yes. Suero oral (ORS) is available over the counter at any pharmacy in Spain for €3-5. Ask for 'Sueroral' or 'sales de rehidratación oral'. Most pharmacies also sell electrolyte sachets like Aquarius powder.
How much does IV rehydration cost in Spain?
At a public ER, IV fluids are free with EHIC/GHIC but expect 2-4 hour waits. A home doctor visit with OnCall Clinic costs €150 and the doctor can administer IV fluids at your accommodation within 1-2 hours.
When is dehydration serious enough to see a doctor?
Seek medical help if you notice dark urine or no urine for 8+ hours, dizziness when standing, rapid heartbeat, confusion, dry mouth with inability to keep fluids down, or if a child under 5 shows these signs. A home doctor can assess and provide IV fluids without an ER visit.