Answer
The pseudoephedrine in Benadryl Allergy Relief Plus Decongestant Capsules increases the risk of dysrhythmias when used with cardiac glycosides.
Sources for this answer
- Benadryl Allergy Relief Plus Decongestant CapsulesMcNeil Products Ltd · emc · SmPC §4.5 Interaction with other medicinal products · Version 9Document updated
Sources checked