Inform your doctor if you have previously experienced any unusual or allergic reactions to nitrates or nitrites. Do also let your doctor know of any other allergies that you may have, including allergies to certain foods, preservatives or dyes.
Elderly are more sensitive to the effects of nitrates, and are more likely to experience dizziness or lightheadedness.
Inform your doctor or pharmacist if you happen to be taking other medications for the control of high blood
pressure, heart medications or sildenafil (Viagra®),
tadalafil (Cialis®), vardenafil (Levitra®).
Do NOT take sildenafil (Viagra®), tadalafil (Cialis®),
vardenafil (Levitra®) if you are taking this medicine.
When sildenafil, tadalafil or vardenafil is taken with
nitrates, blood pressure can lower drastically, resulting
in dizziness, lightheadness or fainting. In some cases,
death has been reported when sildenafil was taken
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