Prescriptions, pharmacies and running out of your medicine in Vietnam

Two situations bring this page most of its readers. The first is three in the morning in a hotel room, having worked out that a pharmacy opens on the corner at six. The second is quieter: a packet that has run out with eleven days of the trip left.

They have the same answer, and it is not the one people expect.

What a prescription is actually for

People treat a prescription as bureaucracy — a form standing between them and the thing they want. It is not. It is the point at which somebody qualified checks a short list on your behalf.

• Everything else you are taking, prescribed or not, and whether any of it clashes
• How your kidneys and liver are working, because that changes how a medicine leaves your body
• Whether you are pregnant or breastfeeding
• What has happened to you before, including how you reacted to anything similar
• Whether a medicine is the right answer at all, or whether something else is going on

Buy it yourself and none of that list gets looked at. Nobody has done it badly. Nobody has done it.

The interactions are the part that harms people

This is worth being blunt about. Sedating medicines — sleep aids, some antihistamines, some painkillers — interact with a long list of ordinary things, alcohol included. On its own, at the right dose, for the right person, such a medicine is usually well tolerated. Stacked on top of something else that also slows breathing or dulls alertness, it is a different proposition. That stacking is invisible at a counter, and often invisible to you, because the other thing may be something you have taken for years without incident.

There is a second, duller problem. If you cannot read the packaging you cannot confirm that you were handed what you asked for, at the strength you expected. Getting a dose wrong in an unfamiliar country, alone, at night, is a bad way to find that out.

Red flags — an emergency, not a pharmacy problem

Call 115 or go to the nearest hospital immediately if any of these apply:

• Poor sleep or low mood comes with thoughts of harming yourself
• Breathing has become slow, shallow or laboured after taking a medicine
• A rash is spreading, with swelling of the lips or tongue
• Someone cannot be woken properly after taking something

See a doctor rather than a counter if

• You have run out of a regular prescription
• You take several medicines at once
• You are pregnant or breastfeeding
• You have breathing problems, or liver or kidney disease
• The problem has run for weeks rather than days

The same name is not the same medicine

One practical thing that catches travellers out: brand names change from country to country. The active ingredient does not.

So the useful thing to carry is not a photograph of your box. It is the generic name — the chemical, not the marketing. Melatonin shows how far the surrounding rules can differ: in the United Kingdom it is prescription-only, while in the United States it sits on a shelf beside the vitamins. Same molecule, different regimes, and travellers cross between them without ever being told.

Write your generic names down before you fly. It solves more problems abroad than anything else on this page.

If sleep is the reason you are reading this

Before reaching for anything, it is worth being honest about what is happening. Adults need roughly seven to nine hours. The usual causes of broken sleep are unglamorous — stress, noise, a room too hot or too cold, an uncomfortable bed — and Vietnam supplies several of them generously. Air conditioning that cycles loudly all night. A street that stays busy past midnight. Heat and humidity that leave a room feeling airless. A body clock that has not caught up with the flight.

Most travel sleeplessness is that list rather than a medical problem, and it settles within about a week. Which means the pharmacy at three in the morning is usually solving a problem that was going to solve itself.

The dull advice works: keep the room dark and cool, get daylight early on your new time zone, stop caffeine after midday, and get up at the same time each day even after a bad night. None of it feels like enough. It still beats most of what people try instead.

What does not fit that pattern

• Sleep that stays broken for several weeks rather than days
• Sleeplessness arriving alongside low mood, breathlessness or pain
• Waking up gasping, or being told that you stop breathing in your sleep
• A regular prescription you have run out of mid-trip

None of those are solved by something bought over a counter, and one or two of them are not sleep problems at all.

What a doctor here can do

• Read through everything you are taking, including anything bought over a counter here, and check it for duplication and interactions
• Tell you the generic name of what you have, and whether an equivalent exists in Vietnam
• Work out whether this is jet lag, a room problem, stress, or something that needs treating
• Go through the non-drug measures properly, which are unfashionable and genuinely effective
• Decide, after examining you, whether a prescription is appropriate — that decision belongs to a doctor here and follows Vietnamese law, not to a website and not to a counter

What nobody can do is promise you a particular medicine before seeing you. Anyone who does is not practising medicine.

If you are bringing your own supply

• Keep tablets in the original labelled container, in your hand luggage — not decanted into a pill organiser, and not in checked baggage
• Carry a copy of your prescription, and for anything in the controlled group a short letter from your prescriber: your name, the generic name, the dose, and what it is for
• Check the rules for your destination and for anywhere you change planes. There is no single global list; the practical route is the International Narcotics Control Board's country pages plus your own embassy's
• If the trip runs past thirty days, sort the supply out before you go rather than mid-trip
• Crossing time zones, take medicines according to the time since your last dose rather than the clock on the wall. This matters more for heart and diabetes medicines than for sleep — ask before a long flight

The short version

Medicines need a prescription because somebody has to check them against the rest of you, and a counter cannot do that. Most travel sleeplessness is heat, noise and a body clock, and it passes in about a week without anything. If it has been weeks rather than days, or you have run out of something you take regularly, that is one short consultation — and a great deal safer than a decision made at three in the morning.