Pregabalin Richter: instructions for use of capsules. Is Pregabalin really as effective as they say? Pregabalin group of drugs
- Instructions for use Pregabalin-Richter
- Composition of the drug Pregabalin-Richter
- Indications for the drug Pregabalin-Richter
- Storage conditions for the drug Pregabalin-Richter
- Shelf life of the drug Pregabalin-Richter
ATX Code: Nervous system (N) > Antiepileptic drugs (N03) > Antiepileptic drugs (N03A) > Other antiepileptic drugs (N03AX) > Pregabalin (N03AX16)
Release form, composition and packaging
caps. 75 mg: 14 or 56 pcs.Capsules size No. 4, Coni-Snap, with a light brown cap and body, without markings.
Excipients:
Composition of the capsule shell: gelatin, iron oxide yellow (E172), titanium dioxide (E171), iron oxide red (E172), iron oxide black (E172).
caps. 150 mg: 14 or 56 pcs.
Reg. No.: 10241/14/18/19 dated 01/28/2019 - Registration period. beat is not limited
Capsules size No. 2, Coni-Snap, with a lid and a brown body, without markings.
Excipients: lactose monohydrate, corn starch, talc.
Composition of the capsule shell: gelatin, iron oxide red (E172), iron oxide black (E172), iron oxide yellow (E172), titanium dioxide (E171).
14 pcs. - blisters (1) - cardboard boxes.
14 pcs. - blisters (4) - cardboard boxes.
Reg. No.: 10241/14/18/19 dated 01/28/2019 - Registration period. beat is not limited
Capsules size No. 0, Coni-Snap, with a lid and dark brown body, without markings.
Excipients: lactose monohydrate, corn starch, talc.
Composition of the capsule shell: gelatin, iron oxide black (E172), iron oxide red (E172).
14 pcs. - blisters (1) - cardboard boxes.
14 pcs. - blisters (4) - cardboard boxes.
Description of the drug PREGABALIN-RICHTER based on officially approved instructions for use of the drug and made in 2019. Update date: 06/05/2019
Pregabalin is an analogue of gamma-aminobutyric acid ((S)-3-(aminomethyl)-5-methylhexanoic acid).
It has been established that pregabalin binds to an additional subunit (α 2 -delta protein) of voltage-gated calcium channels in the central nervous system, irreversibly replacing -gabapentin. It is assumed that such binding may contribute to the analgesic and anticonvulsant effects of pregabalin.
Neuropathic pain
Pregabalin is effective in patients with diabetic neuropathy and postherpetic neuralgia. Efficacy for other types of neuropathic pain has not been studied.
It has been established that when using pregabalin in courses of up to 13 weeks, 2 times a day, and up to 8 weeks, 3 times a day, the risk of side effects and the effectiveness of the drug when taken 2 or 3 times a day are the same.
When taken for a course of up to 13 weeks, pain decreased during the first week, and the effect persisted throughout the course of therapy.
35% of patients treated with pregabalin and 18% of patients treated with placebo experienced a 50% reduction in pain scores. Among patients receiving pregabalin who did not report drowsiness, a 50% reduction in pain index was observed in 33% of cases; among patients receiving placebo, the rate was 18%. Somnolence was reported in 48% of patients receiving pregabalin and 16% of patients receiving placebo.
Fibromyalgia
A marked reduction in pain symptoms in fibromyalgia was observed in patients receiving pregabalin at a dose of 300-600 mg/day. The effectiveness of the 450 mg and 600 mg/day doses was comparable, but the 600 mg/day dose was generally less well tolerated. In addition, with the use of pregabalin, there was an improvement in the functional activity of patients, as well as a decrease in the severity of sleep disorders. The use of pregabalin at a dose of 600 mg/day led to a more pronounced improvement in sleep compared with a dose of 300-450 mg/day.
Epilepsy
When taking the drug for 12 weeks 2 or 3 times a day, the risk of adverse reactions and the effectiveness of the drug with these dosage regimens are the same. A decrease in the frequency of seizures is noted within the first week of taking the drug.
A decrease in the symptoms of generalized anxiety disorder is observed in the first week of treatment. After 8 weeks of treatment, a 50% reduction in Hamilton Anxiety Scale (HAM-A) symptoms was observed in 52% of patients receiving pregabalin and 38% of patients receiving placebo.
Healthy volunteers, patients with epilepsy and patients with chronic pain syndrome showed similar pharmacokinetics of pregabalin at steady state.
Suction
Pregabalin is rapidly absorbed after oral administration on an empty stomach. Cmax in blood plasma is achieved after 1 hour with both single and repeated use. The oral bioavailability of pregabalin is ≥90% and is independent of dose. With repeated use, C ss is achieved within 24-48 hours. Food intake reduces C max by approximately 25-30%, and the time to reach C max increases to approximately 2.5 hours.
However, food intake does not have a clinically significant effect on the overall absorption of pregabalin.
Distribution
The apparent Vd of pregabalin after oral administration is approximately 0.56 L/kg. Pregabalin does not bind to plasma proteins.
The pharmacokinetics of pregabalin when used in the range of recommended daily doses is linear, interindividual variability is low (<20%).
The pharmacokinetics of pregabalin with repeated use can be predicted from single-dose data. Therefore, there is no need for regular monitoring of pregabalin plasma concentrations.
Metabolism
Pregabalin is practically not metabolized. After taking labeled pregabalin, approximately 98% of the radioactive tracer was detected in the urine unchanged. The proportion of N-methylated pregabalin derivative, which is the main metabolite found in urine, was 0.9% of the dose. There was no evidence of racemization of the S-enantiomer of pregabalin into the R-enantiomer.
Removal
Pregabalin is excreted mainly unchanged by the kidneys. The average T1/2 is 6.3 hours. The clearance of pregabalin from blood plasma and renal clearance are directly proportional to QC.
Pharmacokinetics in special groups of patients
Pregabalin clearance is directly proportional to CC. Given that pregabalin is primarily eliminated by the kidneys, it is recommended that the dose of pregabalin be reduced in patients with impaired renal function. In addition, pregabalin is effectively removed from the blood plasma during hemodialysis (after a 4-hour hemodialysis session, the concentration of pregabalin in the blood plasma decreases by approximately 50%), after hemodialysis an additional dose of the drug must be prescribed.
Specific pharmacokinetic studies have not been conducted in patients with impaired liver function. Since pregabalin is practically not metabolized and is excreted mainly unchanged by the kidneys, impaired liver function should not significantly affect the concentration of pregabalin in the blood plasma.
Pregabalin clearance tends to decrease with age, reflecting an age-related decrease in CC. Elderly patients (over 65 years of age) with impaired renal function may require a dose reduction.
The gender of the patient does not have a clinically significant effect on the concentration of pregabalin in the blood plasma.
- treatment of neuropathic pain in adult patients;
- as an adjunctive therapy for epilepsy in adult patients with partial seizures, with or without secondary generalization;
- treatment of generalized anxiety disorder in adult patients;
- treatment of fibromyalgia in adult patients.
The drug is administered orally, regardless of food intake, at a dose of 150 to 600 mg/day in 2 or 3 divided doses.
Neuropathic pain
The initial dose of pregabalin is 150 mg/day. Depending on the achieved effect and tolerability, after 3-7 days the dose can be increased to 300 mg/day, and if necessary, after another 7 days - to a maximum dose of 600 mg/day.
Epilepsy
The initial dose of pregabalin is 150 mg/day. Taking into account the achieved effect and tolerability, after 1 week the dose can be increased to 300 mg/day, and after another week - to a maximum dose of 600 mg/day.
Generalized anxiety disorder
The daily dose of pregabalin ranges from 150 to 600 mg in 2 or 3 divided doses. The need for continued treatment should be regularly assessed.
The initial dose of pregabalin is 150 mg/day. Depending on the effect achieved and tolerability, after 7 days the dose can be increased to 300 mg/day. If there is no positive effect, the dose is increased to 450 mg/day, and if necessary, after another 7 days - to a maximum dose of 600 mg/day.
Fibromyalgia
The initial dose of pregabalin is 75 mg 2 times / day (150 mg / day). Depending on the effect achieved and tolerability, after 3-7 days the dose can be increased to 300 mg/day. If there is no positive effect, the dose is increased to 450 mg/day, and if necessary, after another 7 days - to a maximum dose of 600 mg/day.
Withdrawal of the drug
If treatment with pregabalin must be discontinued, it is recommended that this be done gradually over at least 1 week, regardless of the indication for which the drug was prescribed.
The dose is selected individually taking into account QC (Table 1), which is calculated using the following formula:
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For women, the result should be multiplied by 0.85.
Pregabalin is effectively removed from blood plasma during hemodialysis (50% of the drug within 4 hours). For patients undergoing hemodialysis, the daily dose of pregabalin is adjusted based on renal function. Immediately after each 4-hour hemodialysis session, an additional dose is prescribed (Table 1).
Table 1. Pregabalin dosage based on renal function
* The daily dose (mg/day) should be divided into several parts depending on the frequency of administration of the drug.
An additional dose is given once.
U patients with liver dysfunction no dose adjustment is required.
Elderly patients (over 65 years old) A dose reduction of pregabalin may be required due to decreased renal function.
When missing a dose You should take your next dose of pregabalin as soon as possible. You should not take a double dose of the drug. Regular use of the drug should be resumed the next day.
In a clinical trial program for pregabalin in 8,900 patients (5,600 of whom participated in double-blind, placebo-controlled studies), the most common adverse reactions were dizziness and somnolence. Adverse events observed were mild to moderate. The discontinuation rates of pregabalin and placebo due to adverse events were 12% and 5%, respectively. The main adverse events requiring discontinuation of treatment were dizziness and drowsiness.
Adverse reactions are classified according to systemic organ classes and frequency:
- very often (>1/10), often (>1/100,<1/10), нечасто (>1/1000, <1/100), редко (<1/1000), частота неизвестна (частоту невозможно оценить на основании имеющихся данных). Перечисленные побочные реакции могли быть связаны с основным заболеванием и/или сопутствующей терапией.
Frequency of adverse reactions, incl. from the central nervous system, especially such as drowsiness, increases when treating central neuropathic pain caused by damage to the spinal cord.
Infections and infestations: infrequently - nasopharyngitis.
From the hematopoietic system: rarely - neutropenia.
From the side of metabolism: often - increased appetite;
From the mental side: often - euphoria, confusion, decreased libido, insomnia, irritability, disorientation;
From the nervous system: very often - dizziness, drowsiness;
From the side of the organ of vision: often - blurred vision, diplopia;
From the organ of hearing and balance: often - vertigo;
From the cardiovascular system: infrequently - tachycardia, AV block of the first degree, hot flashes, skin flushing, arterial hypotension, arterial hypertension;
From the respiratory system: infrequently - shortness of breath, dry nasal mucosa;
From the digestive system: often - dry mouth, constipation, vomiting, flatulence;
For the skin and subcutaneous fat: uncommon - sweating, papular rash;
From the musculoskeletal system: uncommon - muscle twitching, joint swelling, muscle spasms, myalgia, arthralgia, back pain, pain in the limbs, muscle stiffness;
From the urinary system: infrequently - dysuria, urinary incontinence;
From the immune system: frequency unknown - angioedema, allergic reactions, hypersensitivity.
From the reproductive system and mammary gland: often - erectile dysfunction;
Others: often - gait disturbance, feeling of "drunkenness", fatigue, edema (including peripheral);
From the laboratory parameters: often - weight gain;
As a result of discontinuation of pregabalin after long-term or short-term therapy, some patients experienced drug withdrawal symptoms:
- insomnia, headache, nausea, anxiety, diarrhea, flu-like syndrome, nervousness, depression, pain, cramps, sweating and dizziness. When prescribing the drug, the patient should be informed about this.
There is evidence that after discontinuation of pregabalin after long-term use, the incidence and severity of withdrawal symptoms may be dose-dependent.
- hypersensitivity to the active substance or any auxiliary component of the drug;
- galactose intolerance, lactase deficiency or glucose-galactose malabsorption;
- children and adolescents up to 17 years of age inclusive (due to lack of data).
Carefully The drug should be used for renal failure, heart failure, as well as in patients with a history of drug dependence (such patients require close medical supervision during treatment with the drug).
Use during pregnancy and breastfeeding
There is insufficient data on the use of pregabalin in pregnant women. IN experimental studies Signs of reproductive toxicity have been reported using animals. The potential risk to humans is unknown. Therefore, Pregabalin-Richter should be used during pregnancy only if the expected benefit to the mother clearly outweighs the possible risk to the fetus.
There are no clinical data regarding the effect of pregabalin on female fertility. Since the potential risk to humans is unknown, when using the drug women of reproductive age must use effective methods of contraception.
There is no information on the excretion of pregabalin into breast milk in women, but it has been noted that in lactating rats it is excreted in milk. Therefore, breastfeeding is not recommended during treatment with pregabalin.
Patients with impaired renal function the dose is selected individually taking into account QC.
Pregabalin is effectively removed from blood plasma during hemodialysis (50% of the drug within 4 hours). For patients undergoing hemodialysis, the daily dose of pregabalin is adjusted based on renal function. Immediately after each 4-hour hemodialysis session, an additional dose is prescribed.
Safety and effectiveness of the drug in children under 12 years of age and adolescents (12-17 years old inclusive) not installed. The use of the drug in children is not recommended.
In some patients with diabetes mellitus, an increase in body weight during treatment with pregabalin may require dose adjustment of hypoglycemic drugs.
If symptoms of angioedema (such as facial swelling, perioral edema or upper respiratory tract swelling) develop, pregabalin should be discontinued.
During treatment with pregabalin, cases of dizziness and drowsiness have been reported, which increase the risk of accidental injury (falls) in elderly patients. There have also been reports of loss of consciousness, confusion and cognitive impairment. Therefore, patients should be advised to exercise caution until the possible side effects of treatment become clear.
In controlled studies, blurred vision was observed more frequently in patients receiving pregabalin than in patients receiving placebo. In most cases, vision was restored after discontinuation of the drug. In clinical studies that included ophthalmologic examination, the incidence of decreased visual acuity and visual field changes was higher among patients receiving pregabalin than among patients receiving placebo. The incidence of fundus examination changes was also higher with pregabalin than with placebo.
During post-marketing use of the drug, adverse reactions from the organ of vision were also observed, which included loss of vision, blurred vision or other changes, many of which were transient. When pregabalin therapy is discontinued, visual symptoms can be expected to resolve or decrease in severity.
There have been cases of renal failure; in some cases, after discontinuation of the drug, kidney function was restored.
There is insufficient information on the possibility of discontinuing other anticonvulsants after achieving seizure control with pregabalin, as well as the advisability of pregabalin monotherapy.
The following adverse events have been observed following discontinuation of pregabalin following long-term or short-term therapy:
- insomnia, headache, nausea, diarrhea, flu-like syndrome, anxiety, nervousness, depression, sweating, dizziness, convulsions. The patient should be informed of these symptoms when initiating treatment with pregabalin.
While using pregabalin or immediately after the end of therapy, seizures may develop, incl. status epilepticus and grand mal seizure.
There is evidence that after discontinuation of pregabalin after long-term use, the incidence and severity of withdrawal symptoms may be dose-dependent.
During post-marketing use of pregabalin, the development of chronic heart failure has been reported in some patients receiving pregabalin. These reactions were predominantly observed in elderly patients with impaired cardiovascular function and those receiving pregabalin for neuropathy. Therefore, pregabalin should be used with caution in this category of patients. After discontinuation of pregabalin, such reactions may disappear.
When treating central neuropathic pain due to spinal cord lesions, an increase in the frequency of adverse reactions from the central nervous system, such as drowsiness, was noted. This may be due to the additive effects of pregabalin and other concomitantly used drugs (eg, antispastic drugs). This circumstance should be taken into account when prescribing pregabalin for this indication.
Suicidal thoughts or behavior have been reported in patients receiving antiepileptic drugs for various indications. The results of a meta-analysis of randomized placebo-controlled trials of antiepileptic drugs indicated a small increase in the risk of suicidal thoughts and behavior. The mechanism of this effect is unknown, and available data do not allow us to exclude such a risk when using pregabalin. In this regard, patients receiving drugs in this group should be carefully monitored for the emergence of suicidal thoughts and behavior, and, if necessary, appropriate treatment should be prescribed. Patients and caregivers should be advised to seek medical attention if suicidal thoughts or behavior occur.
In post-marketing experience, there have been case reports of lower gastrointestinal dysfunction (eg, obstructive and paralytic ileus, constipation) during concomitant use of pregabalin with drugs that can cause constipation, such as opioid analgesics. When using pregabalin and opioid analgesics together, measures should be taken to prevent constipation (especially in women and elderly patients).
There are known cases of dependence development with the use of pregabalin. Patients with a history of drug dependence require close medical monitoring to identify symptoms of pregabalin dependence.
Cases of encephalopathy have been reported, especially in patients with concomitant diseases that could contribute to its development.
The drug contains lactose monohydrate, therefore patients suffering from rare hereditary diseases characterized by galactose intolerance, lactase deficiency or glucose-galactose malabsorption syndrome should not take Pregabalin-Richter.
Impact on the ability to drive vehicles and operate machinery
Pregabalin-Richter may have a mild or moderate effect on the ability to drive vehicles and operate machinery. The drug Pregabalin-Richter can cause dizziness and drowsiness and, accordingly, affect the ability to drive vehicles and operate machinery. Patients should not drive or operate machinery or perform other potentially hazardous activities until it is clear whether this drug affects the ability to perform such tasks.
Since pregabalin is mainly excreted unchanged by the kidneys, undergoes minimal metabolism in humans (less than 2% of the dose is excreted as metabolites by the kidneys), does not inhibit the metabolism of other drugs in vitro and does not bind to plasma proteins, the likelihood of a pharmacokinetic interaction is extremely low.
There was no evidence of clinically significant pharmacokinetic interactions between pregabalin and phenytoin, carbamazepine, valproic acid, lamotrigine, gabapentin, lorazepam, oxycodone and ethanol. It has been established that oral hypoglycemic agents, diuretics, insulin, phenobarbital, tiagabine and topiramate do not have a clinically significant effect on the clearance of pregabalin.
The use of oral contraceptives containing norethisterone and/or ethinyl estradiol simultaneously with pregabalin does not affect the steady-state pharmacokinetics of the drugs.
Pregabalin may potentiate the effects of ethanol and lorazepam. In controlled clinical studies, repeated oral administration of pregabalin concomitantly with oxycodone, lorazepam, or ethanol did not result in clinically significant effects on respiratory function. With the simultaneous use of pregabalin and drugs that depress the central nervous system, respiratory failure and coma may develop. Pregabalin is thought to potentiate oxycodone-induced cognitive and motor impairment.
Special pharmacokinetic studies of the drug in elderly patients have not been conducted. Drug interaction studies were conducted only in adult volunteers.