PSA: PassMedicine Flashcards
Which drugs cause impaired glucose tolerance?
Steroids
Thiazides
Tacrolimus
Ciclosporin
Plus: interferon-alpha, nicotinic acid, antipsychotics, beta-blockers
Which drugs cause urinary retention?
TCAs + Anticholinergics
Plus: opioids, NSAIDs, disopyramide
Which drugs cause lung fibrosis?
Amiodarone
Nitrofurantoin
Busulphan
Bleomycin
Methotrexate
Sulfasalazine
Bromocriptine
Cabergoline
Rifampicin SEs
Orange Secretions
Plus: hepatitis, flu-like sx, liver enzyme inducer
Isoniazid SEs
Peripheral Neuropathy
Plus: hepatitis, agranulocytosis, liver enzyme inhibitor
Pyrazinamide SEs
Hyperuricaemia
Plus: hepatitis, arthralgia, myalgia
Ethambutol SEs
Optic Neuritis
What must be checked before/during starting ethambutol?
Visual Acuity
Lithium SEs
Early: tremor
Intrm: tiredness
Late: arrhythmia, seizure, coma, renal failure, diabetes insipidus
What class of drugs is known for causing a hypertensive crisis w alcohol?
MAOIs
How do you initiate allopurinol prophylaxis of gout?
Wait until the pt is pain free before discussing ULT
Start at 100mg OD unless red eGFR and titrate until serum uric acid <300μmol/L
Use colchicine/NSAIDs as cover ~6m
What are the indication to stop allopurinol immediately?
Development of a rash: SCAR, DRESS, SJS
What should pts at high risk of severe cutaneous ADR be screened for before starting allopurinol?
HLA-B *5801 Allele
What can allopurinol react with? (3)
Azathioprine
Cyclophosphamide
Theophylline
What can aspirin potentiate? (3)
Oral Hypoglycaemics
Warfarin
Steroids
Why should aspirin not be used in <16yo and what’s the exception?
Risk of Reye’s syndrome however in Kawasaki disease benefits>risks
What is first line tx for HTN in pts <55yrs or T2DM?
ACEi/ARB
What is first line tx for HTN in pts >55yrs or Afro-Caribbean?
CCB
What determines step four in the HTN tx ladder?
If K <=4.5 add low dose spironolactone
If K >4.5 add an alpha/beta blocker
Verapamil SEs
HF Bradycardia Hypotension Constipation Flushing
Diltiazem SEs
HF
Bradycardia
Hypotension
Ankle Swelling
Dihydropyridine SEs
Flushing
Ankle Swelling
Headache
What are the indications for ciclosporin?
Transplantation
Plus; RA, UC, psoriasis, pure red cell aplasia
Ciclosporin SEs
Nephrotoxic + Hepatotoxic
Plus everything is inc: fluid retention, hypertension, hyperkalaemia, hypertrichosis, gingival hyperplasia, tremor, impaired glucose tolerance, hyperlipidaemia, susceptibility to infection
Gentamicin SEs
Ototoxic + Nephrotoxic
What is the CI for starting gentamicin?
Myasthenia Gravis
How do you give gentamicin?
It’s poorly lipid-soluble therefore: parentally for IE and topically for otitis externa
How is standard heparin administered?
IV w short duration of action
When does HIT develop?
After 5-10d of tx
What can be used to reverse heparin OD?
Protamine Sulphate
Macrolide Egs
Erythromycin
Clarithromycin
Azithromycin
Macrolide SEs
Prolonged QT
Gastrointestinal
Cholestatic Jaundice
Plus: azithromycin is a/w hearing loss and tinnitus
What should you stop whilst taking a course of macrolides?
Statins: myopathy + rhabdomyolysis
When is metformin used? (3)
T2DM
PCOS
NAFLD
Metformin CIs
CKD
Tissue Hypoxia
Iodine Contrast Media
At what Cr and eGFR should the dose of metformin be reviewed or stopped?
Review: Cr >130 or eGFR <45
Stop: Cr >150 or eGFR <30
Octreotide SE
GS 2° to Biliary Stasis
Mx of Salicylate OD
IV Bicarbonate + Haemodialysis
Mx of TCA OD
IV Bicarbonate
Mx of Ethylene Glycol Poisoning
Fomepizole
Ethanol
Haemodilaysis
Mx of Lead Poisoning
IV Dimercaprol or Calcium Edetate
Mx of Cyanide Poisoning
Hydroxocobalamin or Amyl Nitrite/Sodium Nitrite/Sodium Thiosulfate
Mx of Methanol Poisioning
Fomepizole
Ethanol
Haemodilaysis
List the P450 inhibitors
SICK FFAAACES Dot COM Group
Sodium Valproate
Isoniazid
Cimetidine
Ketoconazole
Fluconazole Fluoxetine Alcohol (Acute) Allopurinol Amiodarone Chloramphenicol Erythromycin Sulphonamides
Disulfiram Ciprofloxacin Omeprazole Metronidazole Grapefruit
List the P450 inducers
PCC SSBAR
Phenytoin
Carbamazepine
Cigarettes
St Johns Wort Sulphonylureas Barbiturates Alcohol (Chronic) Rifampicin
How long is NAC infused over?
1hr
What constitutes a staggered paracetamol OD?
If all the tablets were not taken within 1hr
What are the King’s College Hospital criteria for liver transplantation following a paracetamol OD?
Arterial pH <7.3 @ 24hrs after ingestion or all of: PT >100s, Cr >300μmol/L, grade III/IV encephalopathy
PDE5i Egs
Sildenafil
Tadalafil
Vardenafil
PDE5i CIs
Nitrates
Nicorandil
Hypotension
Stroke/MI <6m
Sildenafil SEs
Blue Discolouration + Flushing
K-Sparing Diuretic Egs
Amiloride
Triamterene
Spironolactone
Eplerenone
ACEi + K-Sparing Diuretic
HyperK
Which drugs should be used w caution in asthmatic pts?
NSAIDs
Adenosine
Beta-Blockers
Which drugs should be used w caution in IHD pts?
NSAIDs
Oestrogen
Varenicline
Which drugs are teratogenic?
Thalidomide Epileptic Retinoid ACEi/ARB Third Element OCP/Hormones Warfarin Alcohol
Plus: abx, statins, sulfonylureas
Quinolone SEs
Dec Seizure Threshold
Tendon Damage
Prolonged QT
Quinolone CIs
Pregnant
Breastfeeding
G6PD Deficiency
Tamoxifen SEs
VTE + Endometrial Cancer
Plus: hot flushes, vaginal bleeding, amenorrhoea
Which drugs should be used w caution in HF pts?
NSAIDs Glucocorticoids Thiazolidinediones Verapamil Flecainide
Which drugs should be used w caution in epileptic pts?
Alcohol Cocaine Amphetamines Ciprofloxacin Levofloxacin Aminophylline Theophylline Bupropion Methylphenidate Mefenamic Acid
How long is tamoxifen typically used for following tumour removal?
5yrs
Tx HTN Pregnant Asthmatic
PET: labetalol (CI in asthma), nifedipine (CI at term), methyldopa 250mg BD/TDS
Tx of Acute Herpes
Maternal: oral aciclovir 400mg TDS
Neonate: IV aciclovir for 14d if SEM disease or 21d if CNS/disseminated
Tx of Post-Immunisation Pyrexia in Infants
If distressed give paracetamol and if unsuitable ibuprofen
What medication can cause hair thinning?
Isotretinoin
5HT3 Antagonists
Ondansetron + Granisetron
SEs: constipation + prolonged QT interval
When should specialist advice be sought before starting ACEi?
K >= 5.0 mmol/L
What enhances and blocks adenosine?
Enhanced by dipyridamole and blocked by theophyllines
HypoK Causes: DIRE
Drugs ie loop and thiazide diuretics
Inadequate intake or intestinal loss
Renal tubular acidosis
Endocrine ie Cushings and Conns
HyperK Causes: DREAD
Drugs ie K-sparing diuretics, ACEi, heparin
Renal failure
Endocrine ie Addisons
Artefact
DKA
How are the doses of gentamicin calculated?
According to pts wt and renal function: 5-7mg/kg OD or divide the daily dose into 1mg/kg if creatinine clearance <20mL/min (12hrly) and endocarditis (8hrly)
What is the target INR for pts on warfarin?
Usually 2.5 unless recurrent VTE or metal valve then inc to 3.5
How do you tx a major bleed when the pt is on warfarin?
Stop Warfarin
Give 5-10mg Slow IV Vitamin K
Give 25-50units/kg IV Dried Prothrombin Complex
What should you do if the INR if above the target?
If >5 w minor bleeding stop warfarin and give 1-3mg Slow IV Vitamin K
<6: reduce warfarin dose
6-8: omit warfarin for 2d then reduce dose
> 8: omit warfarin, give 1-5mg oral vitamin K, start warfarin when INR<5
What is vitamin K on the bnf?
Phytomenadione
What are the target gentamicin concentrations for pts w IE?
Peak 3-5mg/L
Trough <1mg/L
What is the CI to gentamicin?
MG
What are the usual target gentamicin concentrations?
Peak 5-10mg/L
Trough <2mg/L
Where peak is taken 1hr after administration and trough is taken just before the next dose
If the peak is too high dec the dose
If the trough is too high inc the interval
If both the peak and trough are too high do both
What is the paracetamol tx line?
100mg/L@4h - 15mg/L@15h
How long is the NAC infusion given for paracetamol OD?
1hr
When can you measure paracetamol blood levels?
> =4hrs
Tx of Paracetamol OD
Admit and establish exact time taken:
If <1hr give activated charcoal
If 4-8hrs measure serum paracetamol, plot on nomogram and if over tx line commence NAC infusion
If >8hrs commence NAC infusion, measure serum paracetamol and ALT, if over tx line or raised ALT continue
What can a raised urea indicate aside from kidney injury?
Upper GI Bleed: a raised urea w normal creatinine in a pt who is not dehydrated look at hb
Adenosine MOA
Agonist of the A1 receptor in the AV node which inhibits adenylyl cyclase thus red cAMP and causing hyperpolarisation
What is the dosing of aminophylline?
Loading: 5mg/kg given by slow IV over 20mins
Maintenance: 500-700mcg/kg/hr, if elderly red to 300, 1g of aminophylline is added to 1L of 0.9% sodium chloride giving 1mg/mL
Sulphasalazine SEs
Rashes Oligospermia Headache Heinz Body Anaemia Megaloblastic Anaemia Lung Fibrosis
Mesalazine SEs
GI Upset Headache Agranulocytosis Pancreatitis Interstitial Nephritis
What is the key investigation in unwell pts taking aminosalicylates?
FBC - Agranulocytosis
Where should amiodarone be administered?
Central Vein - Thrombophlebitis
How is amiodarone monitored?
Prior: TFT LFT U+E CXR
Every 6m: TFT LFT
Amiodarone SEs
Hypothyroidism Hyperthyroidism Corneal Deposits Pulmonary Fibrosis Liver Fibrosis Peripheral Neuropathy Photosensitivity Slate Grey Appearance Bradycardia Long QT
Which diabetic drug can cause hypoglycaemia?
Gliclazide
Mx of Acne Rosacea
Mild sx - topical metronidazole
Flushing - topical brimonidine
Telangiectasia - laser therapy
Severe sx - oxytetracycline
Rhinophyma - refer to dermatology
Mx of Acne Vulgaris
- Single Topical
- Combo Topical
- Antibiotics
- COCP
- Isotretinoin
Typical Antipsychotic SEs
Acute Dystonia
Tardive Dyskinesia
Parkinsonism
Akathisia
Atypical Antipsychotic SEs
Wt Gain
Sedation
Dyslipidaemia
Hyperprolactinaemia
Acute Dystonia Tx
Procyclidine
Tardive Dyskinesia Tx
Tetrabenazine
Which antipsychotic classically causes a prolonged QT interval?
Haloperidol
What are the paediatric ICS doses?
Low: <200 mcg
Mod: 200-400 mcg
High: >400 mcg
How do you withdraw benzodiazepine?
1/8th daily dose every fortnight
MOA of Benzodiazipines
Inc freq of chloride channels
MOA of Barbiturates
Inc duration of chloride channel opening
Can anticoagulants and antiplatelets be used whilst breastfeeding?
Safe: heparin + warfarin
Avoid: aspirin
Dose of Amoxicillin
500mg TDS
Dose of Clarithromycin
500mg BD
Dose of Ibuprofen
200-400mg TDS
Dose of Codeine
30-60mg QDS
Tx of Croup
Single dose of oral dexamethasone 0.15mg/kg
If emerg: high flow oxygen + adrenaline nebs
CXR of Croup - PA View
‘Steeple Sign’
CXR of Epiglottitis - Lateral View
‘Thumb Sign’
Mx of Fungal Nail Infections
Confirm dx by microbiology
If dermatophyte: 1. oral terbinafine 2. oral itraconazole - fingernails 6w-3m and toenails 3m-6m
If candida: 1. topical amorolfine - fingernails 6m and toenails 12m 2. oral itraconazole 12w
What is the first line SSRI for tx of GAD?
- Sertraline
- SNRI
- Pregabalin
Blotting Techniques
SNoW
DRoP
Southern - DNA
Northern - RNA
Western - Proteins
When do you refer pts with molluscum contagiosum?
If HIV positive and extensive lesions, eyelid margin/ocular lesions and red eye, anogenital lesions
Which drugs exacerbate psoriasis?
NSAIDs Chloroquine Lithium Beta Blockers ACEi Alcohol
Who should you avoid giving citalopram/escitalopram?
Congenital LQTS, known preexisting QT interval prolongation or in combo w other medicines that prolong QT
What is the max dose of citalopram?
40mg - Adults
20mg - Elderly/Hepatic Impairment
When should you F/U pts after commencing antidepressants?
By 2wks but red to 1wk if <30yo or at inc risk of suicide
How long over should you stop SSRIs?
4wks
TCA SEs
Dry Mouth Urinary Retention Blurred Vision Constipation Drowsiness
TCAs: More vs Less Sedative
More: amitriptyline, clomipramine, dosulepin
Less: lofepramine, imipramine, nortriptyline
Mx of Urge vs Stress Incontinence
Urge: bladder retraining, immediate release oxybutynin, mirabegron
Stress: pelvic floor training, retropubic mid-urethral tape, duloxetine
Anticoag/pl in Breastfeeding
Safe: warfarin + heparin
Avoid: aspirin
What is the concentration of aminophylline?
25mg/mL
Statins
LFT: baseline, 3m, 12m
ACEi
U+E: prior to tx, after dose inc, annually - inc of 30% in serum Cr and up to 5.5 K are acceptable changes
Amiodarone
TFT/LFT: prior to tx w U+E/CXR and every 6m
Methotrexate
FBC/LFT/U+E: wkly until stabilised and every 3m thereafter
Azathioprine
FBC/LFT: prior to tx, FBC wkly for first 4w, both every 3m
Lithium
Li/TFT/U+E: prior to tx, Li wkly until stabilised then every 3m, TFT/U+E every 6m
Sodium Valproate
FBC/LFT: prior to tx then LFT periodically during first 6m
Glitazones
LFT: prior to tx then regularly
When are digoxin concentrations measured?
If toxicity is suspected measure within 8-12h of the last dose
What are the features of digoxin toxicity?
Gynaecomastia Arrhythmias Xanthopsia Confusion Anorexia
What classically precipitates digoxin toxicity?
HypoK
Mx of Digoxin Toxicity
Digibind, correct arrhythmias, monitor potassium
When do you monitor gentamicin plasma conc?
Both trough and peak levels: if pre-dose trough is high inc dose interval and if post-dose peak is high dec dose
When should you check phenytoin trough levels?
If you detect non-adherence, suspect toxicity, dose adjustment
What is the range of lithium?
0.4-1.0 mmol/L
What precipitates lithium toxicity?
Drugs
Dehydration
Renal Failure
Which drugs precipitate lithium toxicity?
Diuretics
ACEi/ARB
NSAIDs
Metronidazole
What are the features of lithium toxicity?
Coarse Tremor Hyperreflexia Confusion Polyuria Seizure Coma
Mx of Li Toxicity
Fluid Resus + Haemodialysis
Antipsychotics
Start of therapy/annually: FBC, U+E, LFT, lipids/wt (at 3m), fasting bm/prolactin (at 6m)
Plus: baseline BP/ECG and annual cardiovascular risk assessment
When should you review a pt on HRT?
At 3m after starting or following a change then annually thereafter
What is the therapeutic index of digoxin?
0.5-2.0mcg/L
Which other class of abx can pts w penicillin allergy also be allergic to?
Cephalosporins: 0.5-6.5% of pts
What is Augmentin?
Co-Amoxiclav: Amoxicillin + Clavulanic Acid
What is Magnapen?
Co-Fluampicil: Flucloxacillin + Ampicillin
What is Tazocin?
Piperacillin + Tazobactam
What is Timentin?
Ticarcillin + Clavulanic Acid
What are common prescribing errors wrt frequency?
Wkly: Alendronic Acid + Methotrexate
What are common prescribing errors wrt timing of medication?
At Night: Statins + Amitriptyline
Carbimazole vs Carbmazepine
Carbimazole: Antithyroid
Carbmazepine: Antiepileptic
Chlorphenamine vs Chlorpromazine
Chlorphenamine: Antihistamine
Chlorpromazine: Antipsychotic