Clarithromycin interacts with Levemir (injectable long term insulin type medication) by inhancing its effects. This should be an additional warning with your prescribing information. I was almost comatose as a result of this, and although I stopped the antibiotic and reduced the number of units injected, I'm still not back to "normal"..and it has been 5 days since I stopped the med! You might have had a law suit if I'd died. I have warned my doctors and also Walgreen pharmacy of this problem so no one else will have the same thing happen. I am recovering from the bronchitis with only 4 days on the medication, thank goodness.