Myopathy / Rhabdomyolysis
Simvastatin, like other statins, can cause myopathy, which manifests itself in the form of muscle pain, tenderness, or weakness, and is accompanied by an increase in the activity of CKK (more than 10 times higher than UGN) in blood plasma.Myopathy can manifest itself in the form of rhabdomyolysis, sometimes accompanied by secondary acute renal failure due to myoglobinuria. In rare cases, a lethal outcome was observed. The risk of myopathy increases with an increase in the concentration in the blood plasma of substances that have an inhibitory effect on HMG-CoA reductase. Risk factors for myopathy include the elderly (65 years and older), female gender, uncontrolled hypothyroidism and impaired renal function.
As with other HMG-CoA reductase inhibitors, the risk of myopathy / rhabdomyolysis depends on the dose. In patients with a history of myocardial infarction, when taking simvastatin at a dose of 80 mg per day, the incidence of myopathy is approximately 1.0%, and in patients taking simvastatin in a dose of 20 mg per day - 0.02%. Approximately half of cases of myopathy development are registered during the first year of treatment. The incidence of myopathy during each next year of treatment is approximately 0.1%.
In patients receiving simvastatin in a dose of 80 mg per day, the risk of developing myopathy is higher than when using other statins that cause a comparable decrease in LDL cholesterol. Consequently, the drug Basilip® at a dose of 80 mg per day should be prescribed only to patients with a high risk of cardiovascular complications in whom therapy with a drug in lower doses did not achieve the desired therapeutic effect, and the perceived benefit of treatment exceeds the possible risk. If a patient taking a 80 mg dose of Vasilip® is required to be treated with another drug that can interact with simvastatin, then lower the dose of Vasilip® or prescribe another statin that has less potential for possible drug interaction (see "Contraindications", " "Method of administration and dose").
All patients who start therapy with Vasilip®, as well as patients who need to increase the dose, should be warned about the possibility of myopathy and are informed of the need to immediately seek medical attention in the event of any unexplained muscle pain, tenderness in the muscles or muscle weakness. Therapy with Vasilip® should be stopped immediately if myopathy is suspected or diagnosed.
The presence of the above symptoms and / or more than 10-fold in comparison with VGN increase in the activity of CK in the blood plasma indicate the presence of myopathy. In most cases, after an immediate discontinuation of simvastatin, the symptoms of myopathy are resolved, and the activity of CK in the blood plasma is reduced. In patients starting to take the drug Vazilip® or switching to higher doses of the drug, it is advisable to periodically determine the activity of CK in the blood plasma, but there is no guarantee that such monitoring can prevent the development of myopathy.
Many patients who underwent rhabdomyolysis during simvastatin therapy had a complicated history, including impaired renal function, usually as a result of diabetes mellitus. Such patients require more careful observation.
Therapy with Vasilip® should be temporarily discontinued a few days before the implementation of large surgical interventions, as well as in the postoperative period.
In patients with a high risk of developing cardiovascular disease with the use of simvastatin 40 mg once a day, the incidence of myopathy was slightly higher among patients of Chinese nationality.
Care should be taken when prescribing simvastatin to patients of the Mongoloid race, in particular to prescribe it in low doses.
The risk of developing myopathy / rhabdomyolysis increases with the simultaneous use of simvastatin with the following drugs.
Contraindicated combinations of medicines
- Powerful inhibitors of isoenzyme CYP3A4
Concomitant therapy with potent inhibitors of isoenzyme CYP3A4 at therapeutic doses (eg, itraconazole, ketoconazole, posaconazole, voriconazole, erythromycin, clarithromycin, telithromycin, HIV protease inhibitors, boceprevirov, telaprevir, nefazodone or preparations containing a co-bicarbonate) is contraindicated. If we avoid short-term use of potent inhibitors of isoenzyme CYP3A4 can not, therapy with the drug Vazilip® should be interrupted for the period of their use (see the sections "Contraindications", "Interactions with other drugs").
- Gemfibrozil, ciclosporin or danazol
The simultaneous use of these drugs with the drug Basilip® it is contraindicated (see the sections "Contraindications", "Interactions with other medicinal products").
Other medicines
- Other fibrates
In patients taking fibrates other than gemfibrozil (see the section "Contraindications") or fenofibrate, the dose of simvastatin should not exceed 10 mg per day. With the simultaneous use of simvastatin and fenofibrate, the risk of developing myopathy does not exceed the amount of risks when treating each drug individually. Assign fenofibrate Simvastatin should be treated with caution, since both drugs can cause the development of myopathy. The addition of fibrate therapy to simvastatin therapy usually leads to a slight additional decrease in the concentration of LDL cholesterol in the blood plasma, but allows a more pronounced decrease in TG concentration and an increase in HDL cholesterol concentration in the blood plasma. Combination therapy with fibrates with simvastatin is not accompanied by the development of myopathy (see section "Interactions with other drugs").
- Amiodarone
In patients receiving amiodarone, the dose of simvastatin should not exceed 20 mg per day (see section "Interactions with other drugs").
- Blocks of "slow" calcium channels
In patients receiving verapamil, diltiazem or amlodipine, the dose of simvastatin should not exceed 20 mg per day (see section "Interactions with other drugs").
- Lomitapid
In patients with homozygous familial hypercholesterolemia taking lomitapid, the dose of simvastatin should not exceed 40 mg per day (see section "Interactions with other drugs").
- Moderate inhibitors of isoenzyme CYP3A4 (e.g., dronedaron)
With the simultaneous use of drugs that have moderate inhibitory activity against isoenzyme CYP3A4, and simvastatin, especially at higher doses, may increase the risk of myopathy. With the simultaneous use of simvastatin with moderate isoenzyme inhibitors CYP3A4 may require dose adjustment for simvastatin.
- Fusidic acid
The simultaneous use of fusidic acid and simvastatin may increase the risk of myopathy (see section "Interactions with other drugs"). Simultaneous use of simvastatin and fusidic acid is not recommended. If the use of systemic preparations of fusidic acid is considered necessary, the drug Vazilip® should be canceled for the period of this therapy. In exceptional cases where long-term therapy with fusidic acid systemic drugs is necessary, for example for the treatment of severe infections, the simultaneous use of the drug Vazilip® and fusidic acid should be considered individually in each case, and combined therapy should be carefully monitored.
- Nicotinic acidsa (at lipid-lowering doses not less than 1 g / day)
With the simultaneous use of Vasilip® and nicotinic acid in lipid-lowering doses (at least 1 g / day), cases of myopathy / rhabdomyolysis have been described. In patients with a high risk of cardiovascular disease and a well-controlled concentration of Xc LH1NP using simvastatin 40 mg / day with or without ezetimibe 10 mg / day, there is no additional positive effect on the outcome of cardiovascular disease with the simultaneous use of nicotinic acid in lipid-lowering doses (not less than 1 g / day). Thus, the advantage of simultaneous use of simvastatin with nicotinic acid in lipid-lowering doses (at least 1 g / day) should be carefully weighed against the potential risks of combination therapy.The incidence of myopathy in Chinese patients treated with simvastatin 40 mg or simvastatin / 40 mg / 10 mg ezetimibe is slightly higher with simultaneous application with sustained-release laropiprant / nicotinic acid at a dose of 40 mg / 2 g.
It is not recommended simultaneous use of simvastatin with nicotinic acid in lipid-lowering doses (at least 1 g / day) in patients of the Mongoloid race, since the incidence of myopathy is higher in patients of Chinese nationality than in patients of other nationalities (see "Interactions with Other Drugs" ).
Effects on the liver
In some adult patients taking simvastatin, there is a steady increase in the activity of "hepatic" enzymes (more than 3 times higher than UGN) in blood plasma. With the termination or interruption of simvastatin therapy, the activity of "hepatic" transaminases in blood plasma usually gradually returns to the baseline level. Increased activity of "liver" transaminases in blood plasma was not associated with jaundice or other clinical symptoms. No hypersensitivity reactions were detected.Some of the above patients may have abnormalities in the results of functional hepatic samples before initiating treatment with Vasilip® and / or abusing alcohol.
Before beginning treatment, and then in accordance with clinical indications, all patients are recommended to conduct a study of liver function. Patients who plan to increase the dose of Vasilip® up to 80 mg per day, additional liver function tests should be performed before proceeding to take this dosage, then 3 months after the start of its use and then repeat regularly (for example, once every six months) during the first year of treatment.
Particular attention should be given to patients with increased activity of "liver" transaminases in blood plasma. These patients need to repeat the liver function tests in the near future and subsequently conduct regularly until the normalization of the activity of "liver" transaminases in the blood plasma. In those cases, when the activity of "hepatic" transaminases in the blood plasma increases, especially when the excess of IGN is 3 times, the drug should be canceled.The cause of increased activity of alanine aminotransferase (ALT) in the blood plasma can be muscle damage, so the growth of ALT and CK activity in the blood plasma may indicate the development of myopathy (see section "Special instructions").
There were rare post-registration reports of fatal and non-fatal cases of liver failure in patients taking statins, including simvastatin. If severe liver damage with clinical symptoms and / or hyperbilirubinemia or jaundice occurs in the treatment of simvastatin, immediate therapy should be discontinued. If another cause of the development of this pathology has not been identified, reassignment of simvastatin is contraindicated.
In patients who abuse alcohol and / or patients with impaired liver function, the drug should be used with extreme caution.
Active liver disease or unexplained increase in the activity of "liver" transaminases in blood plasma are contraindications to the appointment of the drug Vazilip®.
During the treatment with simvastatin, as in the treatment with other lipid-lowering medications, a moderate increase (exceeding the VGN by less than 3 times) was observed in the increase in the activity of "liver" transaminases in the blood plasma.These changes appeared soon after the start of treatment, often were transient, were not accompanied by any symptoms and did not require interruption of treatment.
Ophthalmological examination
The data of modern long-term clinical studies do not contain information on the adverse effects of simvastatin on the lens of the human eye.
Use in elderly patients
In patients over the age of 65 years, the efficacy of the drug Vazilip®, estimated by the level of decrease in the concentration of OXC and LDL-C in plasma, was similar to that observed in the population as a whole. There was no significant increase in the incidence of adverse events or changes in laboratory parameters. However, in a clinical study of the use of Vasylip® at a dose of 80 mg per day in patients older than 65 years, there was an increased risk of myopathy compared with patients younger than 65 years.