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Prescribing Information

1 ampoule isosorbide dinitrate (ISDN) i.v. 0.1 % contains 10 mg isosorbide dinitrate in 10 ml sterile isotonic sodium chloride solution. 1 bottle isosorbide dinitrate (ISDN) i.v. 0.1 % (50 ml) contains 50 mg isosorbide dinitrate in 50 ml sterile isotonic sodium chloride solution. For list of excipients, see section PHARMACEUTICAL PARTICULARS. PHARMACEUTICAL FORM(S)
The solution is a clear, colourless and odourless liquid.

ISOKET® 0.1% is indicated in the treatment of unresponsive left ventricular failure secondary
to acute myocardial infarction, unresponsive left ventricular failure of various aetiology and
severe or unstable angina pectoris.

Isosorbide dinitrate must not be used in cases of:
– Hypersensitivity to ISDN, other nitro compounds or to any of the excipients; – acute circulatory failure (shock, circulatory collapse); – cardiogenic shock (shock caused by heart failure), unless a sufficiently high filling pressure in the heart (left ventricular end-diastolic pressure) is ensured by appropriate measures; - Hypertrophic obstructive cardiomyopathy; - Constrictive pericarditis; - Cardiac tamponade; – very low blood pressure (marked hypotension: systolic blood pressure less than 90 mm Hg). - Isoket® 0.1 % solution and phosphodiesterase type 5 inhibitors such as Viagra®, Cialis® or Levitra® must not be used concomitantly, because this may result in a severe blood pressure lowering effect.
isoket® 0.1 % solution must never be used in patients who have recently taken Viagra® or
Cialis® even if acute angina occurs.


Isoket should be used with caution in patients who are suffering from hypothyroidism,
malnutrition, severe liver or renal disease or hypothermia.
Isoket 0.1 % must be used only with particular caution and under medical supervision in: – low filling pressures, e.g. in acute myocardial infarction, impaired left ventricular function (left ventricular failure). Reducing the systolic blood pressure below 90 mm Hg must be avoided; – aortic and/or mitral valve stenosis; – Orthostatic syndrome – diseases associated with an increased intra-cranial pressure (however, until now, a further increase of intracranial pressure has only been observed following the administration of glyceryl trinitrate i.v. in high doses). - The development of tolerance (decrease in efficacy) as well as cross tolerance towards other nitrate-type drugs (decrease in effect in case of a prior therapy with another nitrate drug) has been described. For a decrease in, or loss of, effect to be prevented continuously high dosages must be avoided. Materials of polyethylene (PE), polypropylene (PP) and polytetrafluoroethylene (PTFE) have proved to be suitable for being used for the infusion of isoket® 0.1% solution. However, infusion material made of polyvinyl chloride (PVC) or polyurethane (PU) has been shown to induce a loss of the active substance due to adsorption. If these materials are used the dose must be adjusted to suit patient's needs. Due to the fact that ISDN i.v. 0.1 % is supersaturated with the active substance, a deposit of
crystals may be observed when ISDN i.v. 0.1 % is used in undiluted form. If crystals are
observed, it is safer not to use the solution, although under normal conditions, efficacy is not
Isoket 0.1% must not be used in patients who have recently taken phosphodiesterase
inhibitors (e.g. sildenafil)

Isoket 0.1 % may affect the patient's reactivity to an extent that her/his ability to drive or to
operate machinery is impaired. This effect is increased in combination with alcohol.

Concurrent intake of drugs with blood pressure lowering properties, e.g. beta blockers,
calcium antagonists, vasodilators etc., and/or alcohol may potentiate the hypotensive effect
of isoket® 0.1 % solution. This might also occur with neuroleptics and tricyclic
A blood pressure lowering effect of ISDN i.v. 0.1% will be increased, if used together with
phosphodiesterase inhibitors (e.g. sildenafil) which are used for e.g. erectile dysfunction (see
special warings and contraindications). This might lead to life-threatening cardiovascular
complications. Patients who are on ISDN i.v. 0.1% therapy therefore must not use
phosphodiesterase inhibitors (e.g. sildenafil).
Reports suggest that, when used together with dihydroergotamine (DHE), Isoket® 0.1 %
solution may lead to an increase in the DHE level and thus enhance the hypertensive effect of
the latter.
There is no evidence from animal studies suggesting teratogenic effects of isosorbide
Isosorbide dinitrate must only be used during pregnancy if clearly needed and solely under
the direction and continuous supervision of a physician.
It is not known whether isosorbide dinitrate is excreted in human milk. Because many drugs
are excreted in this way, caution must be exercised when ISDN i.v. 0.1% is administered to a
nursing woman.
Pregnancy category C.

Undesirable effects frequencies are defined as: very common (≥1/10), common (≥1/100,
<1/10), uncommon (≥1/1,000, <1/100), rare (≥1/10,000, <1/1,000) or very rare (<1/10,000).

During administration of ISDN i.v. 0.1 % the following undesirable effects may be observed:
Cardiac disorders:
common: tachycardia, uncommon: enhanced angina pectoris symptoms.
Gastrointestinal disorders:
uncommon: nausea, vomiting, very rare: heartburn.

General disorders and administration site conditions:
common: feeling of weakness
Nervous system disorders:
very common: headache, common: light headedness, dizziness, drowsiness.

Skin and subcutaneous tissue disorders:
uncommon: allergic skin reactions (e.g. rash), flush, very rare: angioedema, Stevens-Johnson-
Syndrome, in single cases: exfoliative dermatitis.
Vascular disorders:
common: hypotension on standing, uncommon: collapse (sometimes accompanied by
bradyarrhythmia and syncope).
Severe hypotensive responses have been reported for organic nitrates including nausea,
vomiting, restlessness, pallor, and excessive perspiration.
Advice: During treatment with ISDN i.v. 0.1 %, a temporary hypoxemia may occur due to a
relative redistribution of the blood flow in hypoventilated alveolar areas. Particularly in
patients with coronary artery disease this may lead to a myocardial hypoxia. If the patient
does not show spontaneous recovery, actions to support the heart and circulation such as
elevation of the legs and volume expansion may be necessary.

The posology must be adjusted to suit the patient's needs and the response of the clinical and
haemodynamic variables must be monitored.
Initially treatment is started with a dose of 1–2 mg/h; then the dose can be adjusted to the
individual requirements. The maximum dose does not normally exceed 8 (-10) mg/h.
Higher doses of 10 mg/h - and up to 50 mg/h in individual cases - may be necessary in
patients suffering from heart failure.
There are no reports so far concerning the treatment in children.

Isoket® 0.1 % solution can be used either diluted in a continuous intravenous infusion by
means of automated equipment, or undiluted using a syringe pump, in a hospital setting; the
cardiac and circulatory parameters must constantly be monitored.
Isoket® 0.1 % solution is compatible with the infusion solutions common in clinical practice
such as physiological saline, 5 - 30 % glucose solution, Ringer’s solution, protein-containing
solutions. When combining Isoket® 0.1 % solution with infusion solutions, observe the
manufacturers’ information on their infusion solutions, specifically the information
concerning the compatibility, contraindications, side-effects and interactions.
Depending on the type and severity of the clinical picture, invasive haemodynamic measurements are indicated to supplement the usual controls (symptoms, blood pressure, heart rate, urine output). Dosage table for diluted solutions: 100 µg/ml:
200 µg/ml:
5 ampoules of 10 ml or
10 ampoules of 10 ml or
1 bottle of 50 ml
2 bottles of 50 ml
topped up to produce 500 ml
topped up to produce 500 ml
Use of the diluted solution: – Concentration 100 µg/ml (0.01 %): Dilute 50 ml of Isoket® 0.1 % solution (5 ampoules of 10 ml or 1 pierce-cap bottle of 50 ml) to produce 500 ml of ready-made solution. – Concentration 200 µg/ml (0.02 %): Dilute 100 ml of Isoket® 0.1 % solution (10 ampoules of 10 ml or 2 pierce-cap bottles of 50 ml) to produce 500 ml of ready-made solution. Use of the undiluted solution: Isoket® 0.1 % solution can also be administered undiluted using a perfusor. Of this solution, 1 ml contains 1 mg of isosorbide dinitrate. OVERDOSE
Animal experience: In mice, significant lethality (LD50) at single intravenous doses of 33.4 mg/kg were observed. Human experience: Symptoms: • Fall of blood pressure ≤ 90 mmHg • Paleness • Sweating • Weak pulse • Tachycardia • Light-headedness on standing • Headache • Weakness • Dizziness • Nausea • Vomiting • Diarrhoea • Methaemoglobinaemia has been reported in patients receiving other organic nitrates. During isosorbide dinitrate biotransformation nitrite ions are released, which may induce methaemoglobinaemia and cyanosis with subsequent tachypnoea, anxiety, loss of consciousness and cardiac arrest. It can not be excluded that an overdose of isosorbide dinitrate may cause this adverse reaction. • In very high doses the intracranial pressure may be increased. This might lead to cerebral symptoms. General procedure: • Stop delivery of the drug • General procedures in the event of nitrate-related hypotension: - The patient must be laid down with lowered head and raised legs - Supply oxygen - Expand plasma volume - Specific shock treatment (admit patient to intensive care unit!) Special procedure: • Raise the blood pressure if the blood pressure is very low • Additional administration of norepinephrine HCl or other vasoconstrictors. The use of epinephrine in this setting is likely to do more harm than good. • Treatment of methaemoglobinaemia - Reduction therapy of choice with vitamin C, methylene-blue, or toluidine-blue - Administer oxygen (if necessary) - Initiate artificial ventilation - Hemodialysis (if necessary) • Resuscitation measures In case of signs of respiratory and circulatory arrest, initiate resuscitation measures immediately. PHARMACOLOGICAL PROPERTIES
Pharmacodynamic properties
Pharmacotherapeutic group: vasodilatators used in cardiac diseases ATC code: C01 DA 08 Isosorbide dinitrate (ISDN) causes a relaxation of vascular smooth muscle thereby inducing a vasodilatation. Both peripheral arteries and veins are relaxed by ISDN. The latter effect promotes venous pooling of blood and decreases venous return to the heart, thereby reducing ventricular end-diastolic pressure and volume (preload). The action on arterial and at higher doses arteriolar vessels, reduces the systemic vascular resistance (afterload). This in turn reduces the cardiac work. The effects on both preload and afterload lead subsequently to a reduced oxygen consumption of the heart. Furthermore, ISDN causes redistribution of blood flow to the subendocardial regions of the heart when the coronary circulation is partially occluded by arteriosclerotic lesions. This last effect is likely to be due to a selective dilation of large coronary vessels. Nitrate induced dilation of collateral arteries can improve the perfusion of poststenotic myocardium. Nitrates also dilate eccentric stenoses as they can counteract possible constricting factors acting on the residual arch of compliant smooth muscle at the site of the coronary narrowing. Furthermore, coronary spasms can be relaxed by nitrates. Nitrates were shown to improve resting and exercise hemodynamics in patients suffering from congestive heart failure. In this beneficial effect several mechanisms including an improvement of valvular regurgitation (due to the lessening of ventricular dilatation) and the reduction of myocardial oxygen demand are involved. By decreasing the oxygen demand and increasing the oxygen supply, the area of myocardial damage is reduced. Therefore, ISDN may be useful in selected patients who suffered a myocardial infarction. Effects on other organ systems include a relaxation of the bronchial muscle, the muscles of the gastrointestinal, the biliary and the urinary tract. Relaxation of the uterine smooth muscles is reported as well. Mechanism of action: Like all organic nitrates, ISDN acts as a donor of nitric oxide (NO). NO causes a relaxation of vascular smooth muscle via the stimulation of guanylyl cyclase and the subsequent increase of intracellular cyclic guanosine monophosphate (cGMP) concentration. A cGMP-dependent protein kinase is thus stimulated, with resultant alteration of the phosphorylation of various proteins in the smooth muscle cell. This eventually leads to the dephosphorylation of the light chain of myosin and the lowering of contractility. Pharmacokinetic properties
The half-life of intravenously infused ISDN amounts to 10 min. ISDN is metabolized to isosorbide 2-mononitrate and isosorbide 5-mononitrate having a half-life of 1.5 to 2 and 4 to 6 h, respectively. Both metabolites are pharmacologically active. The bioavailability of ISDN solution is defined 100 % as all intravenously applied drugs. Preclinical safety data
Acute toxicity: Investigations on the acute toxicity have not revealed any particular risks. Animal studies showed good local tolerability of the undiluted ISDN solution. Similarly, in humans local tolerability was found to be good following administration of both undiluted and diluted solution. Chronic toxicity: Chronic toxicity studies in rats and dogs revealed toxic effects such as CNS symptoms and an increase of liver weight when ISDN was administered in doses as high as 480 and 90 mg/kg b.w. per day, respectively. Reproduction studies: There is no evidence from animal studies suggesting a teratogenic effect of ISDN. Mutagenicity: No evidence for mutagenic effects was found in several tests undertaken both in vitro and in vivo. Carcinogenicity: A long-term study in rats did not provide any evidence for carcinogenicity. PHARMACEUTICAL PARTICULARS
List of excipients
Isoket 0.1 % is compatible with all infusion solutions usually administered in hospital such as physiological sodium chloride solution, 5 - 30% glucose solution, Ringer's solution, solutions containing albumin. Isoket 0.1 % does not contain propylenglycol, ethanol, and potassium ions. Incompatibilities have not been reported. Shelf life
Shelf-life of Isoket 0.1 % as packaged for sale: 5 years. The diluted solution must be administered within 24 hours. The solution concentrate is sterile, but not preserved. The bottle is not intended for multiple use. Do not use after the expiry date. Special precautions for storage
For the reconstituted solution: please store the diluted solution in a refrigerator as long as it is not used within 24 hours. From a microbiological point of view, the product must be used immediately. If not used immediately, in-use storage times and conditions prior to use are the responsibility of the user and would normally not be longer than 24 hours at 2 to 8°C. Nature and contents of container
Isoket 0.1 %: 10ml colourless, O(ne) P(oint) C(ut) glass ampoule 50ml colourless glass bottle Pack size for the ampoules: 10 Pack size for the bottles (50mL): 1 Special precautions for disposal <and other handling>
ISDN i.v. 0.1 % may be administered either diluted in a continuous intravenous infusion by means of an automatic infusion device, or undiluted using a syringe pump, in a hospital setting under constant cardiovascular monitoring. Depending on the type and the severity of the disease, the usual follow-up examinations (symptoms, blood pressure, heart rate, urine) must be completed using invasive hemodynamic measurements. Isoket 0.1 % must be diluted under aseptic conditions immediately after opening. The diluted solution is to be used immediately. 50 ml ISDN i.v. 0.1 % (5 ampoules of 10 ml each or 1 bottle of 50 ml or ½ bottle of 100 ml) made up to 500 ml of ready-for-use solution 100 ml ISDN i.v. 0.1 % (10 ampoules of 10 ml or 2 bottles of 50 ml each, or 1 bottle of 100 ml, respectively) made up to 500 ml of ready-for-use solution Isoket 0.1 % can also be used in undiluted form. 1 ml of this solution contains 1 mg ISDN.

Infusion solution
Packs of 10 ampoules (N2), each containing isosorbide dinitrate 10 mg in
10 ml of solution
Hospital-size packs with 1 pierce-cap bottle of isosorbide dinitrate 50 mg in
50 ml of solution

Schwarz Pharma AG, Monheim, D-40789, Germany
Registration Holder
Pharma Medis Ltd., Fireberg 4, Holon


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