Viagra precautions
The first and most important precaution involves nitrate drugs, including prescription drugs used for angina, which are taken in a variety of different ways: under the tongue, in pills, skin patches, through inhalers, or intravenously. The precaution also applies to the "recreational" use of inhaled nitrates, often referred to as "poppers." This warning applies to all nitrates and all ED pills, and the rule is simple: they don't mix. The problem is a potentially life-threatening fall in blood pressure. Men should not take a nitrate within 24 hours of using Viagra or Levitra or within 48 hours of taking Cialis, which stays in the body longer than the others.
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