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Table 4 nDDIs described between general and OTC medications

From: A pilot study on the impact of known drug-drug interactions in cancer patients

Interaction

N. of cases

Description

Severity

Warfarin x corticosteroids

1

Increased or decreased in anticoagulant effect of warfarin, unknown mechanism

Moderate

Proton pump inhibitors x phenytoin

2

Increased dosage of anticonvulsant required

Minor

Ondansetron x Opioids

1

Severe constipation

Moderate

Acetylsalicylic acid x Warfarin

4

Increased anticoagulant effect of warfarin

Major

Acetylsalicylic acid x ACE inhibitors/beta-blockers

2

Lowering blood pressure effect of ACE inhibitors and beta-blockers may be reduced by prostaglandin synthesis inhibition

Minor