Anticholinergic Drugs; Types, Indications/Uses, Side Effects, Drug Interactions

Last updated: February 7, 2026Reviewed date: February 7, 2026Reading time: 5 min read

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Article Summary

Anticholinergic drugs agent is a substance that blocks the neurotransmitter acetylcholine in the central and the peripheral nervous system. These agents inhibit parasympathetic nerve impulses by selectively blocking the binding of the neurotransmitter acetylcholine to its receptor in nerve cells. The nerve fibers of the parasympathetic system are responsible for the involuntary movement of smooth muscles present in the gastrointestinal tract, urinary tract, lungs, and many other parts of the body. Anticholinergics are divided into three categories in accordance with their specific targets in...

Key Takeaways

This article explains Types Anticholinergic Drugs in simple medical language.
This article explains Mechanism of action of Anticholinergic Drugs in simple medical language.
This article explains Indications/uses of Anticholinergic Drugs in simple medical language.
This article explains Side effects of Anticholinergic Drugs in simple medical language.

Educational health guideWritten for patient understanding and clinical awareness.

Reviewed content workflowUse writer and reviewer profiles for stronger trust.

Emergency safety firstUrgent warning signs are highlighted below.

Seek urgent medical care if you notice

These warning signs are general safety guidance. Local emergency numbers and clinical judgment should always come first.

Severe symptoms, breathing difficulty, fainting, confusion, or rapidly worsening illness.
New weakness, severe pain, high fever, or symptoms after a serious injury.
Any symptom that feels urgent, unusual, or unsafe for the patient.

Emergency now

Use emergency care for severe, sudden, rapidly worsening, or life-threatening symptoms.

See a doctor

Book a professional medical evaluation if symptoms persist, worsen, recur often, affect daily activities, or occur in a high-risk patient.

Learn safely

Use this article to understand possible causes, tests, treatment options, prevention, and questions to ask your clinician.

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Definition

Types Anticholinergic Drugs

Antimuscarinic agents

Atropine
Benztropine
Biperiden
Chlorpheniramine
Dicyclomine (Dicycloverine)
Dimenhydrinate
Diphenhydramine
Doxepin
Doxylamine
Glycopyrrolate
Glycopyrronium
Ipratropium
Orphenadrine
Oxitropium
Oxybutynin
Propantheline bromide
Tolterodine
Tiotropium
Tricyclic antidepressants
Trihexyphenidyl
Scopolamine
Solifenacin
Tropicamide

Antinicotinic agents

Bupropion (Zyban, Wellbutrin) – Ganglion blocker
Dextromethorphan – Cough suppressant and ganglion blocker
Doxacurium – Nondepolarizing skeletal muscular relaxant
Hexamethonium – Ganglion blocker
Mecamylamine – Ganglion blocker and occasional smoking cessation aid
Tubocurarine – Nondepolarizing skeletal muscular relaxant

Mechanism of action of Anticholinergic Drugs

Anticholinergic blocks muscarinic cholinergic receptors, without specificity for subtypes, resulting in a decrease in the formation of cyclic guanosine monophosphate (cGMP). Most likely due to actions of cGMP on intracellular calcium, this results in decreased contractility of smooth muscle.

Anticholinergic is a synthetic derivative of the alkaloid atropine with anticholinergic properties. Anticholinergic antagonizes the actions of acetylcholine at parasympathetic postganglionic effector cell junctions. When inhaled, anticholinergic binds competitively to cholinergic receptors in the bronchial smooth muscle thereby blocking the bronchoconstrictor actions of the acetylcholine (Ach) mediated vagal impulses. Inhibition of the vagal tone leads to dilation of the large central airways resulting in bronchodilation.

Indications/uses of Anticholinergic Drugs

Anticholinergic drugs are used to treat a variety of conditions:

Dizziness (including vertigo and motion sickness-related symptoms)
Extrapyramidal symptoms, a potential side-effect of antipsychotic medications.
Gastrointestinal disorders (e.g., peptic ulcers, diarrhea, pylorospasm, diverticulitis, ulcerative colitis, nausea, and vomiting)
Genitourinary disorders (e.g., cystitis, urethritis, and prostatitis)
Insomnia, although usually only on a short-term basis
Respiratory disorders (e.g., asthma, chronic bronchitis, and chronic obstructive pulmonary disease
Sinus bradycardia due to a hypersensitive vagus nerve

Anticholinergics generally have antisialagogue effects (decreasing saliva production), and most produce some level of sedation, both being advantageous in surgical procedures.

Side effects of Anticholinergic Drugs

Poor coordination
Dementia
Decreased mucus production in the nose and throat; consequent dry, sore throat
Dry-mouth with possible acceleration of dental caries
Stopping of sweating; consequent decreased epidermal thermal dissipation leading to warm, blotchy, or red skin
Increased body temperature
Pupil dilation; consequent sensitivity to bright light (photophobia)
Loss of accommodation (loss of focusing ability, blurred vision – cycloplegia)
Double-vision
Increased heart rate
Tendency to be easily startled
Urinary retention
Urinary incontinence while sleeping
Diminished bowel movement, sometimes ileus (decreases motility via the vagus nerve)
Increased intraocular pressure; dangerous for people with narrow-angle glaucoma.

Possible effects in the central nervous system resemble those associated with delirium, and may include:

Confusion
Disorientation
Agitation
Euphoria or dysphoria
Respiratory depression
Memory problems
Inability to concentrate
Wandering thoughts; inability to sustain a train of thought
Incoherent speech
Irritability
Mental confusion (brain fog)
Wakeful myoclonic jerking
Unusual sensitivity to sudden sounds
Illogical thinking
Photophobia
Visual disturbances
- Periodic flashes of light
- Periodic changes in visual field
- Visual snow
- Restricted or “tunnel vision”
Visual, auditory, or other sensory hallucinations
- Warping or waving of surfaces and edges
- Textured surfaces
- “Dancing” lines; “spiders”, insects; form constants
- Lifelike objects indistinguishable from reality
- Phantom smoking
- Hallucinated presence of people not actually there
Rarely: seizures, coma, and death
Orthostatic hypotension (severe drop in systolic blood pressure when standing up suddenly) and significantly increased risk of falls in the elderly population

Older patients are at a higher risk of experiencing CNS sideffects due to lower acetylcholine production.

A common mnemonic for the main features of anticholinergic syndrome is the following

Blind as a bat (dilated pupils)
Red as a beet (vasodilation/flushing)
Hot as a hare (hyperthermia)
Dry as a bone (dry skin)
Mad as a hatter (hallucinations/agitation)
Bloated as a toad (ileus, urinary retention)
And the heart runs alone (tachycardia)

Drug Interactions

An anticholinergic may interact with the following drugs, supplements & may change the efficacy of drugs

antidepressants such as amitriptyline amoxapine; clomipramine , desipramine, doxepin , imipramine , nortriptyline , protriptyline , and trimipramine
beta blockers such as atenolol , labetalol, metoprolol , nadolol , and propranolol
diuretics
epinephrine
medications for colds, irritable bowel disease, Parkinson’s disease, ulcers, or urinary problems
monoamine oxidase inhibitors such as isocarboxazid, phenelzine, tranylcypromine
other inhaled medications, especially other medications for asthma such as arformoterol , formoterol , metaproterenol, levalbuterol and salmeterol
terbutaline

References

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

Write when the problem started and how it changed.
Bring old prescriptions, investigation reports, and current medicines.
Write allergies, pregnancy status, diabetes, kidney/liver disease, and major past illnesses.
Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

What is the most likely cause of my symptoms?
Which danger signs mean I should go to hospital quickly?
Which tests are necessary now, and which can wait?
How should I take medicines safely and what side effects should I watch for?
When should I come for follow-up?

Tests to discuss

Vital signs: temperature, pulse, blood pressure, oxygen saturation
Basic physical examination by a clinician
CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
Do not delay emergency care when danger signs are present.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

Avoid heavy lifting, sudden bending, and prolonged bed rest.
Use comfortable posture and gentle movement as tolerated.
Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

Do not start antibiotics without a proper medical decision.
Do not use steroid tablets or injections casually for quick relief.
Do not delay emergency care because of home remedies.

Get urgent help if

Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.

Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Doctor / qualified healthcare provider

Tests to discuss with doctor

Basic vital signs: temperature, pulse, blood pressure, oxygen level if needed
Relevant blood, urine, imaging, or specialist tests only after clinical assessment

Questions to ask

What is the most likely cause of my symptoms?
Which warning signs mean I should go to emergency care?
Which tests are really needed now?
Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Go to emergency care if you notice:

Severe or rapidly worsening symptoms
Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration

Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.

Step 1
Check danger signs first

If danger signs are present, seek emergency care and do not wait for online information.
Step 2
Record the symptom story

Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.
Step 3
Visit a qualified clinician

A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.
Step 4
Do only useful tests

Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.
Step 5
Follow up and return early if worse

If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips

Take a written symptom diary and all previous prescriptions/test reports.
Do not hide medicines already taken, even herbal or over-the-counter medicines.
Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

RX Patient Help

Ask a health question safely

Write your symptom story. A health professional or site editor can review it before any answer is prepared. This box is not for emergency care.

Emergency first: Severe chest pain, breathing trouble, unconsciousness, stroke signs, severe injury, heavy bleeding, or rapidly worsening symptoms need urgent local medical care now.

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Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.