Amyl Nitrite

Amyl nitrite is indicated for the rapid relief of angina pectoris. Its effect appears within 30 seconds and lasts for approximately 3 to 5 minutes.

Since it may increase intraocular and intracranial pressures, amyl nitrite is contraindicated or should be used with great caution in patients with glaucoma, recent head trauma or cerebral hemorrhage. Amyl nitrite can cause harm to the fetus when it is administered to a pregnant woman because it significantly reduces systemic blood pressure and blood flow on the maternal side of the placenta.

Transient episodes of dizziness, weakness, or syncope or other signs of cerebral ischemia due to postural hypotension may develop following inhalation of amyl nitrite, particularly if the patient is standing immobile. To hasten recovery, measures which facilitate venous return such as head low posture, deep breathing and movement of extremities may be used.

CAUTION : Amyl nitrite is very flammable. Do not use where it might become ignited. Keep away from open flame or sparks. PRECAUTIONS : Genera l – Tolerance to amyl nitrite may develop with repeated use of the drug for prolonged periods of time. Tolerance may be minimized by beginning with the smallest effective dose and alternating the drug with another coronary vasodilator. High doses of nitrites may produce methemoglobinemia, especially in individuals with methemoglobin reductase deficiency or other metabolic abnormality that interferes with the normal conversion of methemoglobin back to haemoglobin. Patient Information – Amyl nitrite should be taken by the patient when seated or lying down. Drug Interactions – Taking amyl nitrite after drinking alcohol may worsen side effects and may cause severe hypotension and cardiovascular collapse. Carcinogenesis, Mutagenesis, Fertility Impairment – Adequate long term studies to establish adverse carcinogenic potential of this drug have not been reported. Pregnancy – Teratogenic effects: Category C. Animal studies have not been conducted with amyl nitrite. It is also not known whether amyl nitrite can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. Amyl nitrite should be given to a pregnant woman only if clearly needed. Nursing Mothers – It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when amyl nitrite is administered to a nursing woman. Pediatric Use – Safety and effectiveness in children have not been established.

Mild transitory headache, dizziness and flushing of the face are common with the use of amyl nitrite. The following adverse reactions may occur in susceptible patients: syncope, involuntary passing of urine and feces, hypotension, pallor, cold sweat, tachycardia, restlessness, weakness, vomiting and nausea. Excessively high doses of amyl nitrite administered chronically may cause methemoglobinemia.