Cardiovascular |
Aspirin |
In combination with warfarin without a histamine type 2 receptor antagonist (except cimetidine due to warfarin interaction) or PPI due to high risk of GI bleeding.
With a past history of PUD without a histamine 2 receptor antagonist due to risk of bleeding.
In doses exceeding 150 mg/day due to increased bleeding risk and lack of evidence for increased efficacy.
With no history of coronary, cerebral, or peripheral vascular symptoms or occlusive event as aspirin is not indicated.
To treat dizziness not clearly attributable to cerebrovascular disease as aspirin is not indicated.
With concurrent bleeding disorder due to high risk of bleeding.
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β-blockers |
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Calcium channel blockers |
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Clopidogrel |
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Digoxin |
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Dipyridamole |
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Loop diuretics |
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Thiazide diuretics |
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Warfarin |
In combination with aspirin without a histamine type 2 receptor antagonist (except cimetidine due to warfarin interaction) or PPI due to high risk of GI bleeding.
For 1st uncomplicated pulmonary embolism for longer than 12 months duration due to lack of proven benefit.
With concurrent bleeding disorder due to high risk of bleeding.
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CNS |
Anticholinergics |
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Antihistamines (first generation): diphenydramine, chlorpheniramine, cyclizine, promethazine |
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Benzodiazepines (long-acting): chlordiazepoxide, fluazepam, nitrazepam, chlorazepate |
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Benzodiazepines (with long metabolites): dizaepam |
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Neuroleptics |
With long term use of >1 month due to high risk of confusion, hypotension, extra-pyramidal side effects, and falls.
With long term use of >1 month in patients with Parkinson’s disease due to risk worsening, extra-pyramidal symptoms.
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Phenothiazines |
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SSRIs |
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TCAs |
With dementia due to risk of worsening cognitive impairment.
With glaucoma as TCAs may exacerbate glaucoma.
With cardiac conduction abnormalities due to TCAs’ pro-arrhythmic effects.
With constipation as TCAs may worsen constipation.
With opiate or calcium channel blockers as TCAs may worsen constipation.
With prostatism or prior history of urinary retention due to increased risk of urinary retention.
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GI |
Anticholinergic antispasmodic drugs |
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Diphenoxylate, loperamide, or codeine phosphate |
For treatment of diarrhea of unknown cause due to risk of delayed diagnosis, possible exacerbation of constipation with overflow diarrhea, precipitation of toxic megacolon in inflammatory bowel disease, and delayed recovery in unrecognized gastroenteritis.
For treatment of severe infective gastroenteritis (ie, bloody diarrhea, high fever or severe systemic toxicity) due to risk of exacerbation or protraction of infection.
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Prochlorperazine, metoclopramide |
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PPIs |
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Respiratory |
Corticosteroids (systemic) |
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Ipratropium (nebulized) |
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Theophylline |
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Musculoskeletal |
NSAIDs |
With a history of PUD or GI bleeding, unless with concurrent histamine type 2 receptor blocker, PPI or misoprostol due to risk of PUD relapse.
With moderate (160/100–179/109 mmHg) or severe (>180/110 mmHg) hypertension due to risk of exacerbation of hypertension.
With heart failure due to risk of heart failure exacerbation.
With warfarin concomitantly due to risk of GI bleeding.
With chronic renal failure (GFR 20–50 ml/min) due to risk of deterioration in renal function.
With long-term use (>3 months) for relief of mild joint pain in osteoarthritis as simple analgesics preferable and usually as effective for pain relief.
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Colchicine |
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Corticosteroids |
For chronic treatment of gout where there is no contraindication to allopurinol as allopurinol is considered first choice for prophylaxis in gout.
As long-term (>3 months) monotherapy for rheumatoid arthritis or osteoarthritis due to risk of major systemic corticosteroid side-effects.
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Urogenital |
Antimuscarinic drugs |
With dementia due to risk of increased confusion and agitation.
With chronic glaucoma due to risk of acute exacerbation of glaucoma.
With chronic constipation due to risk of exacerbation of constipation.
With chronic prostatism due to risk of urinary retention.
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α-blockers |
In males with frequent incontinence (ie, one or more episodes of incontinence daily) due to risk of urinary frequency and worsening incontinence.
With long term urinary catheter in situ (ie, more than two months) as drug is not indicated.
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Endocrine |
Chlorpropamide or glibenclamide |
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β-blockers |
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Estrogen |
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Drug issues |
Analgesic drugs |
Opiates |
Use of long-term power opiates (eg, morphine or fentanyl) as first line therapy for mild-moderate pain as WHO analgesic ladder is not observed.
Regular use for more than two weeks in those with chronic constipation without use of laxitatives due to risk of severe constipation.
Long-term use in those with dementia unless indicated for palliative care or management of moderate-severe chronic pain syndrome due to risk of exacerbation of cognitive impairment.
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Duplicate drug class |
ACE inhibitors Loop diuretics NSAIDs Opiates SSRIs
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Drugs adversely affecting those prone to fallsb
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Antihistamines (first generation) |
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Benzodiazepines |
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Neuroleptic drugs |
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Opiates |
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Vasodilators (known to cause hypotension) |
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