Contraindications and Precautions for Nitro-BID Ointment and Tadalafil

Introduction to Contraindications

The American College of Cardiology recommends that the concomitant use of Nitro-BID (nitroglycerin) ointment with tadalafil is absolutely contraindicated, as this combination can cause life-threatening hypotension, myocardial infarction, and death 1, 2

The American College of Cardiology states that if a patient has taken tadalafil, at least 48 hours must elapse after the last dose before ANY form of nitrate therapy (including Nitro-BID ointment) can be safely administered 1, 2

The American College of Cardiology notes that tadalafil inhibits phosphodiesterase-5 (PDE5), which degrades cyclic guanosine monophosphate (cGMP); when combined with nitrates, this causes markedly exaggerated and prolonged vasodilation leading to profound hypotension, which is a Class III recommendation (harm) from the ACC/AHA, meaning the intervention should never be performed 1, 2

The European Society of Cardiology suggests beta-blockers as first-line anti-ischemic therapy when nitrates are contraindicated due to recent tadalafil use 3
The American College of Cardiology recommends calcium channel blockers (non-dihydropyridine preferred) for recurrent ischemia, and ACE inhibitors for blood pressure control and cardioprotection 4

The American College of Cardiology warns that never assuming topical nitrates are safer, as Nitro-BID ointment carries the same absolute contraindication as all other nitrate formulations 1, 2
The American College of Cardiology advises that patients presenting with chest pain must be asked about recent PDE5 inhibitor use before receiving nitroglycerin 2

Tadalafil has a half-life of 17.5 hours with effects lasting up to 36 hours 5, 6
Vardenafil has a shorter half-life with effects lasting approximately 4-5 hours 7, 8, 9, 10

No mandatory waiting period is required when switching from tadalafil to vardenafil or vice versa 7, 8, 9, 10
The American Urological Association (AUA) guidelines recommend ensuring trial adequacy before switching PDE5 inhibitors 7, 8, 9

After tadalafil use, wait at least 48 hours before administering any nitrate therapy 5, 6, 7, 8, 9, 10
After vardenafil use, wait at least 24 hours before administering nitrates 7, 8, 9, 10
The combination of PDE5 inhibitors with nitrates can cause profound hypotension, myocardial infarction, and potentially death 5, 6

The AUA guidelines recommend trying a different PDE5 inhibitor if the first one is ineffective or poorly tolerated 7, 8, 9
There is insufficient evidence to support superiority of one PDE5 inhibitor over another 7, 8, 9, 10

Always verify that the patient is not taking nitrates before prescribing any PDE5 inhibitor 5, 6
Document carefully which PDE5 inhibitor and when it was last taken, particularly important for emergency situations where nitrates might be needed 5, 6, 7

The European Society of Cardiology recommends beta-blockers as first-line anti-ischemic therapy when nitrates cannot be used due to recent tadalafil exposure, with a preference for non-dihydropyridine calcium channel blockers for recurrent ischemia 11
The American Heart Association suggests intravenous morphine as the preferred analgesic for chest discomfort unresponsive to other measures, with ACE inhibitors being appropriate for blood pressure control and cardioprotection 12