Contraindications Flashcards
5α reductase inhibitors
finasteride
❌ Pregnant
α-blockers
doxazosin, tamsulosin, alfuzosin
⚠️ Postural hypotension
💊 Beta-blockers to avoid first-dose hypotension
Acetylcholinesterase inhibitors
donepezil, rivastigmine
⚠️ Asthma
⚠️ COPD
⚠️ High risk of developing peptic ulcers
⚠️ Rivastigmine may worsen Parkinson’s
❌ Heart block
❌ Sick sinus syndrome
💊 NSAIDs
💊 Corticosteroids
💊 Antipsychotics
💊 Beta-blockers
Activated charcoal
⚠️ Reduced level of consciousness (unless airway protected)
⚠️ Persistent vomiting
⚠️ Reduced gut motility
Adenosine
⚠️ COPD
⚠️ Heart transplant patients
❌ Hypotension
❌ Coronary ischaemia
❌ Decompensated heart failure
❌ Asthma
Adrenaline
epinephrine
✅ No contraindications in cardiac arrest
⚠️ Heart disease
💊 Beta-blockers
❌ Areas supplied by an end-artery
Aldosterone antagonists
spironolactone, eplerenone
⚠️ Pregnant/lactating women
❌ Severe renal impairment
❌ Hyperkalaemia
❌ Addison’s disease
💊 Potassium-elevating drugs e.g. ACE inhibitors, ARBs
Alginates and antacids
gaviscon, peptac
⚠️ Thickened milk preparations
⚠️ Renal failure
Allopurinol
⚠️ Renal impairment
⚠️ Hepatic impairment
❌ Acute attacks of gout
❌ Recurrent skin rash
❌ Severe hypersensitivity to allopurinol
💊 Azathioprine
💊 ACE inhibitors
Aminoglycosides
gentamicin, amikacin, neomycin
⚠️ Renal impairment
⚠️ Neonates
⚠️ Elderly patients
💊 Loop diuretics
💊 Vancomycin
💊 Ciclosporin
💊 Cephalosporins
Aminosalicylates
mesalazine, sulfasalazine
❌ Aspirin hypersensitivity
Amiodarone
⚠️ Severe hypotension
⚠️ Heart block
⚠️ Active thyroid disease
💊 Digoxin
💊 Diltiazem
💊 Verapamil
ACE inhibitors
ramipril, lisinopril, perindopril
⚠️ Pregnant
⚠️ Breastfeeding
⚠️ CKD
❌ Renal artery stenosis
❌ Acute kidney injury
💊 Potassium-elevating drugs
💊 NSAIDs
Angiotensin receptor blockers
losartan, candesartan, irbesartan
⚠️ Pregnant
⚠️ Breastfeeding
⚠️ CKD
❌ Renal artery stenosis
❌ Acute kidney injury
💊 Potassium-elevating drugs
💊 NSAIDs
Antidepressants
tricyclics; amitriptyline, lofepramine
⚠️ Elderly ⚠️ Epilepsy ⚠️ Cardiovascular disease ⚠️ Prostatic hypertrophy ⚠️ Glaucoma ⚠️ Constipation
❌ Monoamine oxidase inhibitors
Antidepressants
venfalaxine, mirtazapine
⚠️ Elderly
⚠️ Hepatic impairment
⚠️ Renal impairment
⚠️ Arrhythmias
💊 Other antidepressants
Antiemetics - dopamine D2-receptor antagonists
metoclopramide, domperidone
⚠️ Children ⚠️ Young adults ⚠️ Hepatic impairment ⚠️ Intestinal obstruction ⚠️ Parkinson's disease
❌ Neonates
❌ Cardiac conduction abnormalities
❌ Bowel perforation
❌ Dopaminergic agents for Parkinson’s
💊 Antipsychotics
💊 Drugs that prolong the QT interval
💊 CYP inhibitors
Antiemetics - histamine H1-receptor antagonists
cyclizine, cinanrizine, promethazine
⚠️ Hepatic encephalopathy
⚠️ Prostatic enlargement
Antiemetics - serotonin 5-HT3-receptor antagonists
ondansetron, granisetron
⚠️ Prolonged QT interval
💊 Drugs that prolong the QT interval
Antifungal drugs
nystatin, clotrimazole, fluconazole
⚠️ Liver disease
⚠️ Moderate renal impairment
❌ Pregnant
💊 Drugs that are metabolised by CYP enzymes 💊 Carbamazepine 💊 Warfarin 💊 Diazepam 💊 Simvastatin 💊 Sulphonylureas 💊 Clopidogrel 💊 Drugs that prolong the QR interval
Antihistamines - H1-receptor antagonists)
cetirizine, loratadine, fexofenadine, chlorpgenamine
⚠️ Severe liver disease
Antimotility drugs
loperamide, codeine phosphate
⚠️ Acute UC
⚠️ C. difficile colitis
⚠️ Acute bloody diarrhoea
Antimuscarinics - bronchodilators
ipratropium, tiotropoium, glycopyrronium, aclidinium
⚠️ Angle-closure glaucoma
⚠️ Arrhythmias
⚠️ Urinary retention
Antimuscarinics - cardiovascular and GI uses
atropine, hyoscine butylbromide, glycopyrronium
⚠️ Angle-closure glaucoma
⚠️ Arrhythmias
Antimuscarinics - GU uses
oxybutynin, tolterodine, solifenacin
⚠️ Angle-closure glaucoma ⚠️ Arrhythmias ⚠️ Urinary retention ⚠️ Elderly ⚠️ Dementia
❌ Urinary tract infection
💊 Tricyclic antidepressants
Antipsychotics - 1st generation (typical)
haloperidol, chlorpromazine, prochlorperazine
⚠️ Elderly
⚠️ Dementia
⚠️ Parkinson’s
💊 Drugs that prolong the QT interval
Antipsychotics - 2nd generation (atypical)
quetiapine, olanzapine, risperidone, clozapine
⚠️ Cardiovascular diseases
❌ Severe heart disease
❌ Neutropenia
💊 Dopamine-blocking antiemetics
💊 Drugs that prolong the QT interval
Antiviral drugs
aciclovir
⚠️ Pregnant women
⚠️ Breastfeeding
⚠️ Severe renal impairment
Antiplatelet drugs - ADP-receptor antagonists
clopidogrel, ticagrelor, prasugrel
⚠️ Elective surgery
⚠️ Renal and hepatic impairment
❌ Active bleeding
💊 CYP inhibitors and inducers
💊 Antiplatelet drugs
💊 Anticoagulants
💊 NSAIDs
Antiplatelet drugs
aspirin
⚠️ Peptic ulceration
⚠️ Gout
❌ Children under 16
❌ Aspirin hypersensitivity
❌ Third trimester of pregnancy
💊 Antiplatelet drugs
💊 Anticoagulants
Azathioprine
⚠️ Reduced TPMT activity
⚠️ Renal impairment
⚠️ Hepatic impairment
⚠️ Pregnancy
❌ Absent TPMT activity
💊 Allopurinol
💊 Trimethoprim
💊 Warfarin
β-blockers
bisoprolol, atenolol, propanolol, metoprolol, carvedilol
⚠️ Heart failure
⚠️ Haemodynamic instability
⚠️ Hepatic failure
❌ Asthma
❌ Heart block
❌ Verapamil
❌ Diltiazem
β2-agonists
salbutamol, terbutaline, salmeterol, formoterol, indacaterol
⚠️ Cardiovascular disease
Benzodiazepines
diazepam, temazepam, lorazepam, chlordiazepoxide, midazolam
⚠️ Elderly
⚠️ Respiratory impairment
⚠️ Neuromuscular disease
⚠️ Liver failure
💊 CYP inhibitors
💊 Amiodarone
💊 Fluconazole
Bisphosphonates
alendronic acid, disodium pamidronate, zoledronic acid
⚠️ Smokers
⚠️ Dental disease
❌ Severe renal impairment
❌ Hypocalcaemia
❌ Upper GI disorders
💊 Calcium salts
💊 Antacids
Calcium and vitamin D
calcium carbonate, calcium gluconate, colecalciferol, alfacalcidol
❌ Hypercalcaemia
💊 Sodium bicarbonate
Calcium channel blockers
amlodipine, nifedipine, dilitiazem, verapamil
⚠️ Poor left ventricular function
⚠️ AV nodal conduction delay
❌ Unstable angina
❌ Severe aortic stenosis
❌ Beta-blockers