Hypocalcemia
Parsabiv drug reduces the serum calcium concentration and can lead to the development of hypocalcemia (see the section "Side effect"). Treatment with Parsabiv should not be started in patients with chronic renal failure who are on hemodialysis, at a concentration of albumin-corrected calcium in the serum below the lower limit of normal values (see the section "Contraindications").
Follow the patient to identify hypocalcemia. Control of serum calcium concentration should be performed before the start of therapy, within one week after initiation of therapy or dose adjustment, and every 4 weeks of treatment with Parsabiv (see Dosage and Administration section). Possible clinical manifestations of hypocalcemia include paresthesia, myalgia, muscle spasms and convulsions. The patient should be advised to consult a doctor in case of symptoms of hypocalcemia.With a clinically significant decrease in the concentration of albumin-corrected calcium in blood serum, it is necessary to carry out measures aimed at increasing the concentration of calcium in the serum (see section "Method of administration and dose").
Ventricular arrhythmia and lengthening of the interval QT, hypocalcemia
Reducing the concentration of calcium in the blood serum can lead to lengthening of the interval QT, which, in turn, may be accompanied by the development of ventricular arrhythmia. In patients with congenital syndrome of lengthening the interval QT, lengthening the interval QT in the anamnesis, lengthening of the interval QT or sudden cardiac death in a family history, as well as other predictive states of lengthening the interval QT and the development of ventricular arrhythmia, it is necessary to ensure a careful control of the concentration of calcium in the serum during treatment with Parsabiv.
Convulsions
The threshold of convulsive readiness can be reduced with a significant decrease in the concentration of calcium in the blood serum. In patients with convulsive disorders in history, careful monitoring of serum calcium in the course of treatmentpreparation Parsabiv.
Decompensation of chronic heart failure
Decreased myocardial function. hypotension and chronic heart failure may be associated with a significant decrease in serum calcium concentration. Patients with chronic heart failure history (which may be associated with a decrease in serum calcium concentration) is necessary to provide careful control of the calcium concentration in serum during treatment with Parsabiv.
Simultaneous use with other drugs
Patients receiving the drug Parsabiv. Do not administer cinacalcetone (see section "Method of administration and dose"). Their simultaneous application can lead to the development of severe hypocalcemia.
The drug Parsabiv should be administered with caution to patients receiving any other drugs that reduce the concentration of calcium in the blood serum. Patients receiving other medicines that reduce the concentration of calcium in the blood serum should be carefully monitored.
Adynamic bone disease
With prolonged suppression of the concentration of PTH below 100 pg / ml, development of adynamic bone disease is possible. If the PTH concentration falls below the recommended target range, it is necessary to reduce doses or cancel therapy with sterol forms of vitamin D and / or Parsabiv. After withdrawal, therapy is resumed at lower doses to maintain PTH concentration 'within the range of the target values (see section "Dosage and Administration").
Special patient groups
Children
In children, the safety and efficacy of Parsabiv has not been established.
Elderly patients
There were no clinically significant differences in safety and efficacy between patients 65 years of age and older and younger patients (≥ 18 and <65 years). There were no differences in the plasma concentrations of etalkalcetide between patients 65 years of age and older and younger patients (≥ 18 and <65 years). Of the 503 patients who received the Parsabiv drug in placebo-controlled trials, 177 patients (35.2%) were 65 years of age or older.
Liver failure
Ethylcetcide does not undergo hepatic metabolism; so it is expected that liver failure will not have a significant effect on the excretion of ethecalcetide.Influence of hepatic insufficiency on pharmacokinetics ethecalcetide was not studied (see the section "Pharmacokinetics").
Renal insufficiency
Parsabium is indicated for patients on hemodialysis. The effect of the degree of severity of renal insufficiency on the pharmacokinetics of Parsabiv has not been studied (see the section "Pharmacokinetics").
Immunogenicity
Evaluation of the immunogenicity of ethalkylcetide was carried out by means of an immunological study based on surface plasmon resonance, which allowed detecting binding antibodies to ethalkylcetide. In clinical trials, in 7,1% (71 of 995) patients with secondary hyperparathyroidism (GPT) treated with etalkalcetide for up to 6 months, binding antibodies were found (80.3% of them had [57 of 71] antibodies were detected at the initial examination).
There was no change in the pharmacokinetic profile, clinical response, or safety profile due to the presence of antibodies to ethylcalcetide initially present or developed during treatment. If there is a suspicion of the formation of antibodies to etalkalcetide, which is accompanied by clinically significant effects,contact the company "Amgen" to decide whether to conduct a laboratory test to detect antibodies.
Special instructions for use and precautions
Parsabiv does not require mixing or dilution before use. The solution is clear and colorless. Before using the drugs for parenteral administration, a visual inspection must be carried out beforehand to detect foreign particles and discoloration. The solution can not be used in case of turbidity or discoloration, the content of turbid or colored inclusions.