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I purchased Benadryl (Allergy) last evening because I had a bug bite that was itching and swollen. I checked the box to see if I could take it as I am on a blood thinner. There was no warning for taking it--so I did. This morning I am experiencing black stools and after researching on line I found I should not take Diphenhydramine HCI. I feel that a warning for heart patients should be included on your warning list. I would not have used the product if it had warned me. I'm writing because I think you need to be aware of this concern.