NITRO-TIME- nitroglycerin capsule
Nitro-Time by
Drug Labeling and Warnings
Nitro-Time by is a Prescription medication manufactured, distributed, or labeled by Carilion Materials Management. Drug facts, warnings, and ingredients follow.
Drug Details [pdf]
- SPL UNCLASSIFIED SECTION
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DESCRIPTION:
Nitroglycerin is 1,2,3-propanetriol trinitrate, an organic nitrate whose structural formula is:
The organic nitrates are vasodilators, active on both arteries and veins. Each Extended-Release Capsule, for oral administration contains 2.5 mg, 6.5 mg, or 9 mg of Nitroglycerin.
The inactive ingredients in each capsule are corn starch, ethylcellulose, gelatin, lactose monohydrate, pharmaceutical glaze, sugar, talc, and wax. Additionally the 2.5 mg capsule contains FD&C Blue #1, D&C Yellow #10, FD&C Red #40, D&C Red #28; the 6.5 mg capsule contains D&C Yellow #10, FD&C Yellow #6, FD&C Blue #1, D&C Red #33; the 9 mg capsule contains D&C Yellow #10, FD&C Yellow #6, FD&C Green #3, and titanium dioxide.
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CLINICAL PHARMACOLOGY
The principal pharmacological action of nitroglycerin is relaxation of vascular smooth muscle and consequent dilation of peripheral arteries and veins, especially the latter. Dilatation of the veins promotes peripheral pooling of blood and decreases venous return to the heart, thereby reducing left ventricular end-diastolic pressure and pulmonary capillary wedge pressure (preload). Arteriolar relaxation reduces systemic vascular resistance, systolic arterial pressure, and mean arterial pressure (afterload). Dilatation of the coronary arteries also occurs. The relative importance of preload reduction, afterload reduction, and coronary dilatation remains undefined. Dosing regimens for most chronically used drugs are designed to provide plasma concentrations that are continuously greater than a minimally effective concentration. This strategy is inappropriate for organic nitrates. Several well-controlled clinical trials have used exercise testing to assess the anti-anginal efficacy of continuously-delivered nitrates. In the large majority of these trials, active agents were indistinguishable from placebo after 24 hours (or less) of continuous therapy. Attempts to overcome nitrate tolerance by dose escalation, even to doses far in excess of those used acutely, have consistently failed. Only after nitrates had been absent from the body for several hours was their anti-anginal efficacy restored.
: The volume of distribution of nitroglycerin is about 3 L/kg, and nitroglycerin is cleared from this volume at extremely rapid rates, with a resulting serum half-life of about 3 minutes. The observed clearance rates (close to 1 L/kg/min) greatly exceed hepatic blood flow; known sites of extrahepatic metabolism include red blood cells and vascular walls. Pharmacokinetics
The first products in the metabolism of nitroglycerin are inorganic nitrate, and the 1,2- and 1,3-dinitroglycerols. The dinitrates are less effective vasodilators than nitroglycerin, but they are longer-lived in the serum, and their net contribution to the overall effect of chronic nitroglycerin regimens is not known. The dinitrates are further metabolized to (non-vasoactive) mononitrates and, ultimately, to glycerol and carbon dioxide.
To avoid development of tolerance to nitroglycerin, drug-free intervals of 10-12 hours are known to be sufficient; shorter intervals have not been well studied. In one well-controlled clinical trial, subjects receiving nitroglycerin appeared to exhibit a rebound or withdrawal effect, so that their exercise tolerance at the end of the daily drug-free interval was than that exhibited by the parallel group receiving placebo. less
Reliable assay techniques for plasma nitroglycerin levels have only recently become available, and studies using these techniques to define the pharmacokinetics of oral nitroglycerin preparations have not been reported. Published studies using older techniques provide results that often differ, in similar experimental settings, by an order of magnitude.
: Controlled trials of single oral doses of nitroglycerin have demonstrated that nitroglycerin capsules can effectively reduce exercise-related angina for up to 5 hours. Anti-anginal activity is present about 1 hour after ingestion of a capsule. Clinical Trials
Controlled trials of multiple-dose oral nitroglycerin have shown statistically significant anti-anginal efficacy 2½ and 4 hours after a dose when oral nitroglycerin had been administered four times a day for 2 weeks or three times a day for 1 week. As noted above, careful studies with other formulations of nitroglycerin have shown that maintenance of continuous 24-hour plasma levels of nitroglycerin results in insurmountable tolerance. Presumably, the studied 1-week and 2-week regimens of oral nitroglycerin therapy achieved adequate nitrate-free intervals by non-uniformity of dosing interval, with longer intervals overnight. The investigators did not report how subjects interpreted their dosing instructions, and they similarly did not report which dose of the day was the one after which they obtained the end-of-trial exercise results.
Thus, these studies of oral nitroglycerin should be interpreted as demonstrations that these regimens provide round-the-clock anti-anginal protection. From large, well-controlled studies of other nitroglycerin formulations, it is reasonable to believe that the maximal achievable daily duration of anti-anginal effect from Nitroglycerin Extended-Release Capsules is about 12 hours. not
In some controlled trials of other organic nitrate formulations, efficacy has declined with time. Because the controlled, multiple-dose trials of oral nitroglycerin did not include exercise tests before the last day of treatment, it is not known how the efficacy of Nitroglycerin Extended-Release Capsules may vary during extended therapy.
- INDICATIONS AND USAGE
- CONTRAINDICATIONS
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WARNINGS
The benefits of oral nitroglycerin in patients with acute myocardial infarction or congestive heart failure have not been established. If one elects to use nitroglycerin in these conditions, careful clinical or hemodynamic monitoring must be used to avoid the hazards of hypotension and tachycardia.
Because the effects of capsules are so difficult to terminate rapidly, they are not recommended in these settings.
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PRECAUTIONS
: Severe hypotension, particularly with upright posture, may occur with even small doses of nitroglycerin. This drug should therefore be used with caution in patients who may be volume depleted or who, for whatever reason, are already hypotensive. Hypotension induced by nitroglycerin may be accompanied by paradoxical bradycardia and increased angina pectoris. General
Nitrate therapy may aggravate the angina caused by hypertrophic cardiomyopathy.
As tolerance to other forms of nitroglycerin develops, the effect of sublingual nitroglycerin on exercise tolerance, although still observable, is somewhat blunted.
In industrial workers who have had long-term exposure to unknown (presumably high) doses of organic nitrates, tolerance clearly occurs. Chest pain, acute myocardial infarction, and even sudden death have occurred during temporary withdrawal of nitrates from these workers, demonstrating the existence of true physical dependence.
Some clinical trials in angina patients have provided nitroglycerin for about 12 continuous hours of every 24-hour day. During the nitrate-free intervals in some of these trials, anginal attacks have been more easily provoked than before treatment, and patients have demonstrated hemodynamic rebound and exercise tolerance. The importance of these observations to the routine, clinical use of oral nitroglycerin is not known. decreased
: Daily headaches sometimes accompany treatment with nitroglycerin. In patients who get these headaches, the headaches are a marker of the activity of the drug. Patients should resist the temptation to avoid headaches by altering the schedule of their treatment with nitroglycerin, since loss of headache is likely to be associated with simultaneous loss of anti-anginal efficacy. Information for Patients
Treatment with nitroglycerin may be associated with lightheartedness on standing, especially just after rising from a recumbent or seated position. This effect may be more frequent in patients who have also consumed alcohol.
: The vasodilating effects of nitroglycerin may be additive with those of other vasodilators. Alcohol, in particular, has been found to exhibit additive effects of this variety. Drug Interactions
Marked symptomatic orthostatic hypotension has been reported when calcium channel blockers and organic nitrates were used in combination. Dose adjustments of either class of agents may be necessary,
: Studies to evaluate the carcinogenic or mutagenic potential of Nitroglycerin have not been performed. Nitroglycerin's effect upon reproductive capacity is similarly unknown. Carcinogenesis, Mutagenesis, and Impairment of Fertility
: Animal reproduction studies have not been conducted with nitroglycerin. It is also not known whether nitroglycerin can cause fetal harm when administered to a pregnant woman or whether it can affect reproductive capacity. Nitroglycerin should be given to a pregnant woman only if clearly needed. Pregnancy category C
: It is not known whether nitroglycerin is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when nitroglycerin is administered to a nursing woman. Nursing Mothers
: Clinical studies of Nitroglycerin Extended-release Capsules did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy. Geriatric Use
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ADVERSE REACTIONS
Adverse reactions to nitroglycerin are generally dose-related, and almost all of these reactions are the result of nitroglycerin's activity as a vasodilator. Headache, which may be severe, is the most commonly reported side effect. Headache may be recurrent with each, daily dose, especially at higher doses. Transient episodes of lightheadedness, occasionally related to blood pressure changes, may also occur. Hypotension occurs infrequently, but in some patients it may be severe enough to warrant discontinuation of therapy. Syncope, crescendo angina, and rebound hypertension have been reported but are uncommon.
Allergic reactions to nitroglycerin are also uncommon, and the great majority of those reported have been cases of contact dermatitis or fixed drug eruptions in patients receiving nitroglycerin in ointments or patches. There have been a few reports of genuine anaphylactoid reactions, and these reactions can probably occur in patients receiving nitroglycerin by any route.
Extremely rarely, ordinary doses of organic nitrates have caused methemoglobinemia in normal-seeming patients; for further discussion of its diagnosis and treatment, see . OVERDOSAGE
Data are not available to allow estimation of the frequency of adverse reactions during treatment with Nitroglycerin Extended-Release Capsules.
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OVERDOSAGE
: The ill effects of nitroglycerin overdose are generally the result of nitroglycerin's capacity to induce vasodilation, venous pooling, reduced cardiac output, and hypotension, These hemodynamic changes may have protean manifestations, including increased intracranial pressure, with any or all of persistent throbbing headache, confusion, and moderate fever; vertigo; palpitations; visual disturbances; nausea and vomiting (possibly with colic and even bloody diarrhea); syncope (especially in the upright posture); air hunger and dyspnea, later followed by reduced ventilatory effort; diaphoresis, with the skin either flushed or cold and clammy; heart block and bradycardia; paralysis; coma; seizures; and death. Hemodynamic Effects
Laboratory determinations of serum levels of nitroglycerin and its metabolites are not widely available, and such determinations have, in any event, no established role in the management of nitroglycerin overdose.
No data are available to suggest physiological maneuvers (e.g., maneuvers to change the pH of the urine) that might accelerate elimination of nitroglycerin and its active metabolites. Similarly, it is not known which – if any – of these substances can usefully be removed from the body by hemodialysis.
No specific antagonist to the vasodilator effects of nitroglycerin is known, and no intervention has been the subject of controlled study as a therapy of nitroglycerin overdose. Because the hypotension associated with nitroglycerin overdose is the result of venodilation and arterial hypovolemia, prudent therapy in this situation should be directed toward increase in central fluid volume. Passive elevation of the patients legs may be sufficient, but intravenous infusion of normal saline or similar fluid may also be necessary.
The use of epinephrine or other arterial vasoconstrictors in this setting is likely to do more harm than good.
In patients with renal disease or congestive heart failure, therapy resulting in central volume expansion is not without hazard. Treatment of nitroglycerin overdose in these patients may be subtle and difficult, and invasive monitoring may be required.
: Nitrate ions liberated during metabolism of nitroglycerin can oxidize hemoglobin into methemoglobin. Even in patients totally without cytochrome b reductase activity; however, and even assuming that the nitrate moieties of nitroglycerin are quantitatively applied to oxidation of hemoglobin, about 1 mg/kg of nitroglycerin should be required before any of these patients manifests clinically significant (≥10%) methemoglobinemia. In patients with normal reductase function, significant production of methemoglobin should require even larger doses of nitroglycerin. In one study in which 36 patients received 2 to 4 weeks of continuous nitroglycerin therapy at 3.1 to 4.4 mg/hr, the average methemoglobin level measured 0.2%; this was comparable to that observed in parallel patients who received placebo. Methemoglobinemia5
Notwithstanding these observations, there are case reports of significant methemoglobinemia in association with moderate overdoses of organic nitrates. None of the affected patients had been thought to be unusually susceptible. Methemoglobin levels are available from most clinical laboratories. The diagnosis should be suspected in patients who exhibit signs of impaired oxygen delivery despite adequate cardiac output and adequate arterial p0 . Classically, methemoglobinemic blood is described as chocolate brown, without color change on exposure to air. 2
When methemoglobinemia is diagnosed, the treatment of choice is methylene blue, 1 to 2 mg/kg intravenously.
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DOSAGE AND ADMINISTRATION:
As noted above ( ) careful studies with other formulations of nitroglycerin have shown that maintenance of continuous 24-hour plasma levels of nitroglycerin results in tolerance (i.e., loss of clinical response). Every dosing regimen for Nitroglycerin Extended-Release Capsules should provide a daily nitrate-free interval to avoid the development of this tolerance. The minimum necessary length of such an interval has not been defined, but studies with other nitroglycerin formulations have shown that 10 to 12 hours is sufficient. Large controlled studies with other formulations of nitroglycerin show that no dosing regimen with Nitroglycerin Extended-Release Capsules should be expected to provide more than about 12 hours of continuous anti-anginal efficacy per day. CLINICAL PHARMACOLOGY
The pharmacokinetics of Nitroglycerin capsules, and the clinical effects of multiple-dose regimens, have not been well studied. In clinical trials, the initial regimen of Nitroglycerin has been 2.5 to 6.5 mg three to four times a day, with subsequent upward dose adjustment guided by symptoms and side effects. In one trial, 5 of the 18 subjects were titrated up to a dose of 26 mg four times a day.
- HOW SUPPLIED
- STORAGE
- Nitroglycerin 6.5 mg caps
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INGREDIENTS AND APPEARANCE
NITRO-TIME
nitroglycerin capsuleProduct Information Product Type HUMAN PRESCRIPTION DRUG Item Code (Source) NDC: 68151-2503(NDC:0904-0644) Route of Administration ORAL Active Ingredient/Active Moiety Ingredient Name Basis of Strength Strength NITROGLYCERIN (UNII: G59M7S0WS3) (NITROGLYCERIN - UNII:G59M7S0WS3) NITROGLYCERIN 6.5 mg Inactive Ingredients Ingredient Name Strength STARCH, CORN (UNII: O8232NY3SJ) ETHYLCELLULOSES (UNII: 7Z8S9VYZ4B) GELATIN (UNII: 2G86QN327L) ANHYDROUS LACTOSE (UNII: 3SY5LH9PMK) SHELLAC (UNII: 46N107B71O) SUCROSE (UNII: C151H8M554) TALC (UNII: 7SEV7J4R1U) CARNAUBA WAX (UNII: R12CBM0EIZ) D&C YELLOW NO. 10 (UNII: 35SW5USQ3G) FD&C YELLOW NO. 6 (UNII: H77VEI93A8) FD&C BLUE NO. 1 (UNII: H3R47K3TBD) D&C RED NO. 33 (UNII: 9DBA0SBB0L) Product Characteristics Color BLUE (BLUE) , YELLOW (YELLOW) Score no score Shape CAPSULE (CAPSULE) Size 8mm Flavor Imprint Code TCL;1222 Contains Packaging # Item Code Package Description Marketing Start Date Marketing End Date 1 NDC: 68151-2503-6 1 in 1 PACKAGE Marketing Information Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date UNAPPROVED DRUG OTHER 01/29/2004 Labeler - Carilion Materials Management (079239644) Registrant - Carilion Materials Management (079239644) Establishment Name Address ID/FEI Business Operations Carilion Materials Management 079239644 REPACK(68151-2503)
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