WHAT IS THIS MEDICINE AND
WHAT IS IT USED FOR?
Bethanecol (also spelled bethanechol) is
a medicine that stimulates the muscular wall of the bladder to contract, making
it easier to pass urine. It belongs to a group called cholinergic or
parasympathomimetic agents, which mimic the effects of the body's own nerve
signals that control bladder function. Bethanecol is used specifically for
non-obstructive urinary retention — meaning difficulty or inability to urinate
when there is NO physical blockage — which can happen after surgery,
childbirth, or due to a nerve condition affecting the bladder (neurogenic
bladder).
3. HOW TO TAKE THIS MEDICINE
Take on an EMPTY STOMACH — at least 1
hour before or 2 hours after a meal. Swallow with a glass of water. The typical
dose is 25–50 mg taken 3–4 times a day. Your doctor may start you on a lower
dose (5–10 mg) to find the right amount for you. Take at evenly spaced times
throughout the day. Drug effects begin within 30 minutes and usually last about
1 hour.
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PATIENT TIP: Elderly patients may be more sensitive to side effects — a lower
starting dose is advised. There are no specific dose adjustments for kidney
or liver disease, but caution is recommended. Not well studied in children. |
4. POSSIBLE SIDE EFFECTS
|
How Common? |
Side Effects to Know About |
|
Common (>1 in 10) |
Nausea and vomiting
(especially if taken with food), abdominal cramps, diarrhoea, increased
saliva, sweating, tearing eyes, facial flushing |
|
Less Common |
Headache, dizziness,
general feeling of unwellness, urgent need to urinate |
|
Seek Medical Help |
Bronchospasm (tightening
of the airways — can trigger asthma attacks), severe drop in blood pressure
(especially on standing up), very slow heart rate. If you have difficulty
breathing, call emergency services immediately. |
5. WHO SHOULD NOT TAKE THIS
MEDICINE
Do not use if you have: asthma or a
history of bronchospasm, an overactive thyroid (hyperthyroidism), a stomach
ulcer (peptic ulcer disease), epilepsy or seizure disorder, a blockage in your
urinary tract (mechanical obstruction), Parkinson's disease, heart rhythm
problems, or have recently had stomach or bladder surgery.
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IMPORTANT SAFETY INFORMATION: NOT FOR BLADDER
OBSTRUCTION: Bethanecol must only be used when a physical blockage has been
ruled out — using it with an obstruction can cause serious injury to the
bladder or urinary tract. ASTHMA RISK: Can trigger
serious bronchospasm — strictly contraindicated in asthmatic patients. HYPOTENSION: Rise slowly
from sitting or lying positions, especially when starting treatment. OVERDOSE ANTIDOTE:
Atropine (0.6 mg by injection) is the antidote for bethanecol toxicity. |
6. MEDICINES THAT INTERACT
WITH THIS TREATMENT
Anticholinergic medicines (atropine,
antihistamines, tricyclic antidepressants, bladder medicines): directly
counteract bethanecol's effects. Procainamide, quinidine: reduce effectiveness.
Ganglionic blockers (mecamylamine): risk of severe low blood pressure. No
significant food interactions, but take on empty stomach.
7. HOW TO STORE THIS
MEDICINE
Store at room temperature (15°C–30°C) in
the original container with the desiccant packet. Protect from heat, moisture,
and light. Keep out of reach of children.
8. PRESCRIPTION REQUIREMENT
|
Status |
Prescription Only Medicine
(POM) |
9. GUIDANCE FOR PATIENTS
& CAREGIVERS
Take this tablet on an empty stomach — 1
hour before or 2 hours after eating. This helps your bladder muscle squeeze
properly so you can pass urine. Rise slowly when getting up to avoid dizziness.
If you accidentally take too much or feel your chest tightening/difficulty
breathing, seek emergency help immediately — this medicine can cause breathing
problems in some people. Do not take bethanecol if you have asthma, a stomach
ulcer, or thyroid problems without first consulting your doctor.
10. PHARMACIST &
PRESCRIBER NOTES
|
Clinical Dispensing Notes |
Confirm indication: must
be non-obstructive urinary retention — mechanical obstruction is an absolute
contraindication. Screen for asthma (bronchospasm risk), hyperthyroidism, and
peptic ulcer. Counsel on empty-stomach administration and orthostatic hypotension
risk. Inform carer/patient that atropine is the antidote in overdose. Monitor
for therapeutic response within 60–90 minutes. |
11.
FREQUENTLY ASKED QUESTIONS
Q: Why must I take bethanechol on an
empty stomach?
A: Taking bethanechol with food
significantly increases the risk of nausea and vomiting. Taking it at least 1
hour before or 2 hours after eating helps reduce these side effects without
affecting how well the medicine works.
Q: How long does it take for bethanechol
to work?
A: Effects usually begin within 30
minutes of taking the tablet and are strongest at about 60–90 minutes. The
effect typically lasts for about 1 hour.
Q: Can I take bethanechol if I have
asthma?
A: No — bethanechol is contraindicated
in asthma. It can cause bronchospasm (tightening of the airways), which could
trigger a serious asthma attack. If you have asthma, tell your doctor before
taking this medicine.
Q: What happens if I take too much
bethanechol?
A: Overdose causes excessive cholinergic
effects: sweating, vomiting, severe stomach cramps, very slow heart rate, low
blood pressure, and difficulty breathing. The antidote is atropine injected by
a healthcare professional. Seek emergency help immediately.
Q: Can I drive while taking bethanechol?
A: Bethanechol can cause dizziness and
affects alertness in some people. Until you know how it affects you, avoid
driving or operating heavy machinery, especially when first starting treatment.