Parkinson's medicines in hospital: why timing is critical

The NHS explains that levodopa is absorbed by nerve cells in the brain and turned into dopamine. Its effect does not last all day, and over the years the effect between doses can shorten, which gives the on-off swings the NHS describes, where movement alternates quickly between mobile and stiff. A dose taken an hour late may therefore mean an hour of rigidity, slowness, tremor or freezing.

In a hospital that has many patients, fixed drug rounds and an unfamiliar ward, doses can slip. For a person without Parkinson's a delayed tablet means little. For someone with Parkinson's, it can mean being unable to swallow, get out of bed, reach the toilet or cough effectively, which raises the risk of falls, chest infection and prolonged stay. This is why clinicians describe Parkinson's medicines as time-critical.

The NHS describes several main groups: levodopa, dopamine agonists, MAO-B inhibitors such as selegiline and rasagiline, and COMT inhibitors used later. Parkinson's UK lists nine drug types, adding anticholinergics, amantadine, apomorphine and newer delivery systems. Each has its own timing, form and side effects.

Many people take levodopa on a personal schedule that is not a neat "three times a day": for example at 7, 10, 1, 4 and 7. The hospital chart should copy the real schedule from your own list, not substitute standard drug-round times. Ask staff to confirm it on the drug chart on admission.

The NHS leaflet gives practical points that apply on a ward. Take it at the same times each day. Take it at least 30 minutes before a meal or 60 minutes after, because protein can reduce absorption. If you miss a dose, leave it out and take the next at the usual time rather than doubling. If you cannot swallow capsules, speak to the pharmacist, doctor or specialist nurse about alternatives, such as dispersible tablets stirred in water.

It also stresses that you should not stop suddenly because of the risk of serious withdrawal, with muscle stiffness, high fever and confusion. That is the reason nil-by-mouth instructions before a procedure need a Parkinson's plan rather than simply omitting tablets.

Because Parkinson's is caused by low dopamine, drugs that block dopamine can worsen symptoms. The NHS co-beneldopa page lists medicines for psychosis or schizophrenia, including amisulpride, aripiprazole, haloperidol and risperidone, and anti-sickness medicines metoclopramide, domperidone and prochlorperazine, as ones to discuss with a doctor before use. Hospital settings are where these drugs are most often reached for, for nausea after surgery, agitation or delirium.

The NHS also notes that iron supplements and antacids can affect absorption, that anticholinergic drugs including some antihistamines and bladder medicines can interfere, and that stronger painkillers such as codeine, morphine and tramadol need advice. Mild painkillers like paracetamol and ibuprofen are generally acceptable according to the same page. Wear a wristband or carry a card that says "Parkinson's - time-critical medicines".

If a procedure is planned, ask at pre-assessment for a written plan covering the day before, the morning of surgery, how medicines will be given during fasting, and when they restart. The NHS says to tell the doctor in advance because stopping before a general anaesthetic may be needed. Some units can give medicines through a tube or alternatives if swallowing is not possible, and the specialist nurse can advise.

Pack your own medicines in original packaging, a list with exact times, your Parkinson's nurse or neurologist contact details, and a photo of your medicine chart. Tell your family or carer the timetable so someone can speak up if a dose is late.

• Ask for your usual times to be written on the drug chart.

• Ask whether you can keep and take your own supply under supervision, according to ward policy.

• Request the Parkinson's nurse or specialist pharmacist review if admitted.

• Say clearly if you are due a dose, even if the round is not until later.

Sudden inability to swallow, a very high temperature with stiffness, new confusion or hallucinations, or collapse in someone with Parkinson's needs urgent assessment. Call 999 in an emergency. Tell staff the time of the last dose.

Dopamine agonists can cause sleepiness, confusion, hallucinations and compulsive behaviours such as gambling or shopping, according to the NHS, and dose changes in hospital may need review. See the wider guides for the condition on this site.