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Table 5 Description of the top-20 and clinically important potential drug–drug interactions in patients with pneumonia

From: Potential drug-drug interactions among pneumonia patients: do these matter in clinical perspectives?

Interacting pairs

Frequency

Severity

Documentation

Potential adverse outcomes

Aspirin – Furosemide

40

Major

Good

Reduced diuretic effectiveness and possible nephrotoxicity

Furosemide – Hydrocortisone

39

Moderate

Fair

Hypokalemia

Aspirin – Clopidogrel

37

Major

Fair

Increased risk of bleeding

Aspirin – Insulin

33

Moderate

Fair

Hypoglycemia

Isoniazid – Rifampin

33

Major

Good

Hepatotoxicity

Calcium containing products – Ceftriaxone

33

Contraindicated

Good

Formation of ceftriaxone-calcium precipitates and is contraindicated in neonates

Pyrazinamide – Rifampin

32

Major

Good

Hepatotoxicity

Aspirin – Ramipril

28

Moderate

Fair

Decreased ramipril effectiveness

Albuterol – Furosemide

28

Moderate

Fair

ECG changes or hypokalemia

Aspirin – Bisoprolol

23

Moderate

Good

Increased blood pressure

Furosemide – Ramipril

23

Moderate

Good

Postural hypotension (first dose)

Clarithromycin – Dexamethasone

23

Major

Fair

Decrease clarithromycin exposure and increased dexamethasone exposure

Aspirin – Dexamethasone

21

Moderate

Good

Increased risk of gastrointestinal ulceration and subtherapeutic aspirin serum concentrations

Aspirin – Nitroglycerin

20

Moderate

Good

Increase in nitroglycerin concentrations and additive platelet function depression

Clopidogrel – Esomeprazole

17

Major

Excellent

Reduced plasma concentrations of clopidogrel active metabolite and reduced antiplatelet activity

Azithromycin – Moxifloxacin

16

Major

Fair

Increased risk of QT-interval prolongation

Aspirin – Spironolactone

16

Major

Good

Reduced diuretic effectiveness, hyperkalemia, or possible nephrotoxicity

Clopidogrel – Omeprazole

13

Major

Excellent

Reduced plasma concentrations of clopidogrel active metabolite and reduced antiplatelet activity

Omeprazole – Rifampin

13

Moderate

Fair

Decreased omeprazole plasma concentrations

Ramipril – Spironolactone

13

Major

Good

Hyperkalemia