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warnings and cautions
5 WARNINGS AND PRECAUTIONS Tolerance: Excessive use may lead to tolerance. ( 5.1 ) Hypotension: Severe hypotension may occur. ( 5.2 ) 5.1 Tolerance Excessive use may lead to the development of tolerance. Only the smallest number of doses required for effective relief of the acute angina attack should be used [see Dosage and Administration (2.1) ]. 5. 2 Hypotension Severe hypotension, particularly with upright posture, may occur even with small doses of nitroglycerin particularly in patients with constrictive pericarditis, aortic or mitral stenosis, patients who may be volume-depleted, or are already hypotensive. Hypotension induced by nitroglycerin may be accompanied by paradoxical bradycardia and increased angina pectoris. Symptoms of severe hypotension (nausea, vomiting, weakness, pallor, perspiration and collapse/syncope) may occur even with therapeutic doses. 5.3 Hypertrophic Obstructive Cardiomyopathy Nitrate therapy may aggravate the angina caused by hypertrophic obstructive cardiomyopathy. 5.4 Headache Nitroglycerin produces dose-related headaches, especially at the start of nitroglycerin therapy, which may be severe and persistent but usually subside with continued use.
6 ADVERSE REACTIONS Most common adverse reactions occurring at a frequency greater than 2 % are headache, dizzinesss and paresthesia ( 6 ). To report SUSPECTED ADVERSE REACTIONS, contact Prasco Laboratories at 1-866-525-0688 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice. Adverse reactions occurring at a frequency greater than 2 % and greater than placebo included: headache, dizziness, and paresthesia. 6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of Nitroglycerin Lingual Spray and other nitroglycerin drugs. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to estimate their frequency reliably or establish a causal relationship to drug exposure. Neurologic: weakness, drowsiness Dermatologic: cutaneous vasodilation, flushing, drug rash, exfoliative dermatitis Gastrointestinal: nausea, vomiting Respiratory: transient hypoxemia Cardiovascular: tachycardia