WHAT IS THIS MEDICINE AND WHAT IS IT USED FOR?
Pexola contains pramipexole, a medicine that works by mimicking the
action of dopamine — a chemical messenger (neurotransmitter) in the brain that
controls movement, motivation, and reward. In Parkinson's disease, the brain
cells that produce dopamine gradually die off, causing the characteristic
symptoms of tremor (shaking), rigidity (stiffness), slowness of movement
(bradykinesia), and difficulty with balance.
Pramipexole stimulates dopamine receptors in the brain to compensate for
this loss. In restless legs syndrome (RLS), an unpleasant urge to move the legs
— especially at rest or in the evenings — is also thought to involve dopamine
dysregulation.
Pramipexole is used in adults for: Parkinson's disease — to treat the
motor symptoms, either alone in early disease or alongside levodopa as the
condition progresses; and moderate to severe restless legs syndrome (RLS) — to
reduce the urge to move the legs and improve sleep quality.
3. HOW TO TAKE THIS MEDICINE
For Parkinson's disease: treatment is started at a very low dose (0.125
mg three times daily) and increased gradually over several weeks. The usual
maintenance dose is between 1.5mg and 4.5 mg/day in divided doses.
The 1mg tablet (0.7mg base) represents a maintenance dose. Take three
times daily with or without food. For restless legs syndrome: lower doses are
used — typically taken once daily, 2 to 3 hours before bedtime. Your
neurologist will specify your exact dosing schedule. Do not change your dose or
stop suddenly without medical guidance.
Pramipexole doses are expressed in two different ways — as the salt
(dihydrochloride) or as the base — which can cause confusion. Confirm which
units your prescription uses. For example: 1mg of the dihydrochloride
monohydrate salt is equivalent to 0.7mg of pramipexole base. Always use the
dose your neurologist has specified.
⚠ PATIENT TIP: Never stop pramipexole suddenly
without speaking to your neurologist — abrupt discontinuation can cause a
dangerous syndrome including severe rigidity, high temperature, and confusion
(similar to neuroleptic malignant syndrome). If you need to stop for any
reason, doses should be reduced gradually over several days.
4. POSSIBLE SIDE EFFECTS
|
How Common? |
Side Effects |
|
Very Common |
Nausea (especially
when starting or increasing dose — usually improves after a few weeks),
sleepiness, dizziness — particularly when standing up (orthostatic
hypotension), involuntary movements (dyskinesia — more common when used
alongside levodopa), headache |
|
Common |
Tiredness,
constipation, visual disturbances, confusion, hallucinations (seeing or
hearing things that are not there — particularly in older patients), low
blood pressure, peripheral oedema (swollen ankles) |
|
Serious — Tell Your
Doctor |
Impulse control
disorders — a significant and underrecognised side effect: pramipexole can
cause compelling, difficult-to-resist urges including compulsive gambling,
excessive shopping, hypersexuality, binge eating, or other repeated
behaviours that are out of character. These must be reported to your
neurologist. Sudden onset of sleep ('sleep attacks') — can occur without
warning and may make driving unsafe. Hallucinations or confusion — especially
in elderly patients. |
5. WHO SHOULD NOT TAKE THIS MEDICINE
Pramipexole should not be taken if you have a known hypersensitivity to
it. Use with great caution in patients with kidney disease — the dose must be
reduced based on kidney function (eGFR), as pramipexole is mainly cleared by
the kidneys. Use with caution in patients with heart disease. The risk of
hallucinations and confusion is higher in elderly patients.
⚠ IMPULSE CONTROL DISORDERS: This is one of the
most important and underreported side effects of dopamine agonists. Patients or
carers must monitor for sudden changes in behaviour — particularly gambling,
excessive internet or shopping use, hypersexuality, or binge eating. These
changes can emerge gradually and the person experiencing them may not recognise
them as a side effect. Families and carers should be informed. Report any such
changes to your neurologist promptly.
⚠ DRIVING AND SLEEP ATTACKS: Pramipexole can
cause sudden, unexpected episodes of sleep — even in people who do not feel
particularly drowsy beforehand. Do not drive or operate heavy machinery until
you are certain the medicine does not affect your ability to stay alert.
Discuss driving with your neurologist.
⚠ DO NOT STOP SUDDENLY: Gradual dose reduction
is essential when stopping pramipexole — abrupt withdrawal can cause a severe
syndrome. Always discuss any plan to stop with your neurologist.
6. MEDICINES THAT INTERACT WITH THIS TREATMENT
Medicines that block dopamine — including antipsychotics (haloperidol,
risperidone, olanzapine) and metoclopramide (a common anti-nausea medicine) —
directly oppose pramipexole's effects and significantly worsen Parkinson's
symptoms. These should be avoided where possible — always check with your
neurologist before starting any new medicine. Cimetidine (an older heartburn
medicine) reduces pramipexole elimination and can increase side effects — use
an alternative antacid or H2 blocker. Alcohol increases sedation.
7. HOW TO STORE THIS MEDICINE
Store below 25°C. Protect from light. Keep in original packaging. Keep
out of reach of children.
8. PRESCRIPTION REQUIREMENT
|
Field |
Details |
|
Status |
Prescription Only
Medicine (POM) — Specialist (neurology) prescription required for Parkinson's
disease; GP or specialist prescription for restless legs syndrome |
9. GUIDANCE FOR PATIENTS & CAREGIVERS
Take your tablets at the same times each day as prescribed by your
neurologist. If nausea is a problem when you first start, taking the tablet
with food usually helps — it settles for most people within a few weeks. Never
stop pramipexole suddenly — always speak to your neurologist if you want to
reduce or stop.
Talk openly with your family and your neurologist about any changes in
behaviour — compulsive urges to gamble, spend money, eat, or seek sex can occur
with this medicine and are a side effect, not a character flaw. If you notice
yourself feeling very sleepy during the day or having moments of sudden
sleepiness, do not drive until you have discussed this with your neurologist.
10. PHARMACIST & PRESCRIBER NOTES
|
Field |
Details |
|
Clinical Dispensing
Notes |
DOSE NOTATION ALERT:
Pramipexole is expressed in two ways — salt (dihydrochloride monohydrate) and
base. 1mg salt = 0.7mg base. Confirm which unit is used in the prescription
to avoid dosing errors. Impulse control disorder (ICD) counselling is
mandatory for patient AND carer/family — gambling, hypersexuality, binge
eating, compulsive shopping. Provide ICD information leaflet if available.
Sleep attack counselling — advise caution with driving and machinery. Do not
discontinue abruptly — taper under neurologist guidance. Renal dose
adjustment: reduce dose based on eGFR (significant impairment requires
substantial dose reduction or extended dosing intervals). Dopamine antagonist
drug interaction screening: metoclopramide and all antipsychotics oppose
pramipexole and worsen Parkinson's — screen all new prescriptions. Alcohol
interaction — additive sedation. |
11. FREQUENTLY ASKED QUESTIONS
Q: Why can't I stop the medicine suddenly?
Sudden withdrawal from pramipexole can cause a dangerous withdrawal
syndrome — with severe muscle rigidity, high fever, and confusion. Dose
reduction must be done gradually over several days under neurological
supervision.
Q: Why is nausea common at the start?
Dopamine agonists stimulate receptors throughout the body, including
those in the gut and brain that can trigger nausea. This is usually temporary —
it typically improves significantly within the first few weeks as your body
adjusts. Taking the tablet with food can help.
Q: Can pramipexole cause hallucinations?
Yes — particularly in older patients or at higher doses. Hallucinations
(seeing or hearing things that are not there) should always be reported to your
neurologist — the dose may need to be adjusted or a different medicine
considered.
Q: My legs feel restless at night and stop me sleeping — how does
pramipexole help?
Restless legs syndrome (RLS) is linked to reduced dopamine activity in
the brain's movement-control pathways, particularly in the evening. Pramipexole
boosts dopamine signalling, which reduces the uncomfortable urge to move the
legs and helps people get a better night's sleep.