Rosmifen

Uses

Primary hypercholesterolemia (type IIa including heterozygous familial hypercholesterolemia), mixed dyslipidemia (type IIb), or homozygous familial hypercholesterolemia in patients who have not responded adequately to diet and other appropriate measures; prevention of cardiovascular events in patients at high risk of a first cardiovascular event.

Rosmifen is also used to associated treatment for these conditions: Atherosclerosis, Atherosclerotic Cardiovascular Diseases, Cardiovascular Disease (CVD), Cardiovascular Events, Dysbetalipoproteinemia, Heterozygous Familial Hypercholesterolemia, High Blood Pressure (Hypertension), High Cholesterol, Homozygous Familial Hypercholesterolemia, Hypertension,Essential, Hypertriglyceridemias, Major Adverse Cardiovascular Events, Mixed Dyslipidemias, Postoperative Thromboembolism, Primary Hypercholesterolemia, Primary Hyperlipidemia, Cardiovascular Primary Prevention, Lipid-Lowering Therapy

How Rosmifen works

Rosuvastatin is a statin medication and a competitive inhibitor of the enzyme HMG-CoA (3-hydroxy-3-methylglutaryl coenzyme A) reductase, which catalyzes the conversion of HMG-CoA to mevalonate, an early rate-limiting step in cholesterol biosynthesis. Rosuvastatin acts primarily in the liver, where decreased hepatic cholesterol concentrations stimulate the upregulation of hepatic low density lipoprotein (LDL) receptors which increases hepatic uptake of LDL. Rosuvastatin also inhibits hepatic synthesis of very low density lipoprotein (VLDL). The overall effect is a decrease in plasma LDL and VLDL.

In vitro and in vivo animal studies also demonstrate that rosuvastatin exerts vasculoprotective effects independent of its lipid-lowering properties, also known as the pleiotropic effects of statins. This includes improvement in endothelial function, enhanced stability of atherosclerotic plaques, reduced oxidative stress and inflammation, and inhibition of the thrombogenic response.

Statins have also been found to bind allosterically to β2 integrin function-associated antigen-1 (LFA-1), which plays an important role in leukocyte trafficking and in T cell activation.

Rosuvastatin exerts an anti-inflammatory effect on rat mesenteric microvascular endothelium by attenuating leukocyte rolling, adherence and transmigration. The drug also modulates nitric oxide synthase (NOS) expression and reduces ischemic-reperfusion injuries in rat hearts. Rosuvastatin increases the bioavailability of nitric oxide by upregulating NOS and by increasing the stability of NOS through post-transcriptional polyadenylation. It is unclear as to how rosuvastatin brings about these effects though they may be due to decreased concentrations of mevalonic acid.

Dosage

Rosmifen dosage

Before treatment initiation the patient should be placed on a standard cholesterol-lowering diet that should continue during treatment. The dose should be individualized according to the goal of therapy and patient response, using current consensus guidelines.

Treatment of hypercholesterolemia: Patient of Asian origin or with risk factors for myopathy or rhabdomyolysis: initially 5 mg once daily increased if necessary to max. 20 mg daily.

Prevention of cardiovascular events: Patient of Asian origin or with risk factors for myopathy or rhabdomyolysis: initially 5 mg once daily increased if necessary to max. 20 mg daily.

Pediatric Use (Hyperlipidemia including familial hypercholesterolemia):

• Child younger than 6 years: not recommended.
• Child 6–9 years: initially 5 mg daily, increased if necessary at intervals of at least 4 weeks to usual max. 10 mg once daily.
• Child 10–18 years: initially 5 mg daily, increased if necessary at intervals of at least 4 weeks to usual max. 20 mg once daily.

[Reduced dose required with concomitant atazanavir, darunavir, ezetimibe, fibrate, itraconazole, lopinavir, or tipranavir]

Use in the elderly (>70 years): A start dose of 5 mg is recommended. No dose adjustment necessary.

Renal insufficiency:Initially 5mg once daily (do not exceed 20 mg daily) if eGFR is 30-60 mL/minute/1.73 m2. Avoid if eGFR is less than 30 mL/minute/1.73 m2

Hepatic impairment:

• Child-Pugh scores of <7: no increase in systemic exposure to rosuvastatin.
• Child-Pugh scores of 8 and 9: increased systemic exposure has been observed. In these patients an assessment of renalfunction should be considered.
• Child-Pugh scores >9: no study.

Rosuvastatin is contraindicated in patients withactive liver disease.

Race: Increased systemic exposure has been seen in Asian subjects. The recommended starting dose is 5 mg for patients of Asian ancestry. The 40 mg dose is contraindicated in these patients.

Genetic polymorphisms: Specific types of genetic polymorphisms are known that can lead to increased rosuvastatin exposure. For patients who are known to have such specific types of polymorphisms, a lower daily dose of Rosuvastatin is recommended.

Dosage in patients with pre-disposing factors to myopathy: The recommended starting dose is 5 mg in patients with predisposing factors to myopathy. The 40 mg dose is contraindicated in some of these patients.

Rosuvastatin may be given at any time of day, with or without food

Side Effects

Common or very common: Proteinuria.

Rare: Hepatitis, jaundice.

Very rare: Gynecomastia, hematuria, hepati failure, interstitial lung disease, lupus erythematosus-like reactions, pancreatitis.

Frequency not known: Alopecia, altered liver function tests, amnesia, arthralgia, asthenia, depression, dizziness, edema, fatigue, gastrointestinal disturbances, headache, hypersensitivity reactions, hyperglycemia -may be associated with the development of diabetes mellitus (particularly in those already at risk of the condition), myalgia, myopathy, myositis, paresthesia, peripheral neuropathy, pruritus, rash, rhabdomyolysis, sexual dysfunction, sleep disturbance, Stevens-Johnson syndrome, thrombocytopenia, urticaria, visual disturbance.

Muscle effects: The risk of myopathy, myositis, and rhabdomyolysis associated with statin use is rare. Although myalgia has been reported commonly in patients receiving statins, muscle toxicity truly attributable to statin use is rare. Muscle toxicity can occur with all statins, however the likelihood increases with higher doses If muscular symptoms or raised creatine kinase occur during treatment, other possible causes (e.g. rigorous physical activity, hypothyroidism, infection, recent trauma, and drug or alcohol addiction) should be excluded before statin therapy is implicated, particularly if statin treatment has previously been tolerated for more than 3 months. When a statin is suspected to be the cause of myopathy, and creatine kinase concentration is markedly elevated (more than 5 times upper limit of normal), or if muscular symptoms are severe, treatment should be discontinued. If symptoms resolve and creatine kinase concentrations return to normal, the statin should be reintroduced at a lower dose and the patient monitored closely; an alternative statin should be prescribed if unacceptable side-effects are experienced with a particular statin. Statins should not be discontinued in the event of small, asymptomatic elevations of creatine kinase. Routine monitoring of creatine kinase is unnecessary in asymptomatic patients.Statins should not be discontinued if there is an increase in the blood-glucose concentration or HbA1C as the benefits continue to outweigh the risks.

Interstitial lung disease: If patients develop symptoms such as dyspnoea, cough, and weight loss, they should seek medical attention.

Toxicity

Generally well-tolerated. Side effects may include myalgia, constipation, asthenia, abdominal pain, and nausea. Other possible side effects include myotoxicity (myopathy, myositis, rhabdomyolysis) and hepatotoxicity. To avoid toxicity in Asian patients, lower doses should be considered. Pharmacokinetic studies show an approximately two-fold increase in peak plasma concentration and AUC in Asian patients (Philippino, Chinese, Japanese, Korean, Vietnamese, or Asian-Indian descent) compared to Caucasian patients.

Precaution

Hypothyroidism should be managed adequately before starting treatment with a statin. Statins should be used with caution in those with a history of liver disease or with a high alcohol intake. There is little information available on a rational approach to liver-function monitoring; however, a NICE guideline1 suggests that liver enzymes should be measured before treatment, and repeated within 3 months and at 12 months of starting treatment, unless indicated at other times by signs or symptoms suggestive of hepatotoxicity. Those with serum transaminases that are raised, but less than 3 times the upper limit of the reference range, should not be routinely excluded from statin therapy. Those with serum transaminases of more than 3 times the upper limit of the reference range should discontinue statin therapy.

Statins should be used with caution in those with risk factors for myopathy or rhabdomyolysis; patients should be advised to report unexplained muscle pain. Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose galactose malabsorption should not take this medicine.

Interaction

Cyclosporine: Cyclosporine increased rosuvastatin exposure (AUC) 7-fold. Therefore, in patients taking cyclosporine, the dose of Rosuvastatin should not exceed 5 mg once daily.

Gemfibrozil: Gemfibrozil significantly increased rosuvastatin exposure. Due to an observed increased risk of myopathy/rhabdomyolysis, combination therapy with Rosuvastatin and gemfibrozil should be avoided. If used together, the dose of Rosuvastatin should not exceed 10 mg once daily.

Protease Inhibitors: Coadministration of rosuvastatin with certain protease inhibitors has differing effects on rosuvastatin exposure. Simeprevir, which is a hepatitis C virus (HCV) protease inhibitor, or combinations of atazanavir/ritonavir or lopinavir/ritonavir, which are HIV-1 protease inhibitors, increase rosuvastatin exposure (AUC) up to threefold. For these protease inhibitors, the dose of Rosuvastatin should not exceed 10 mg once daily. The combinations of fosamprenavir / ritonavir or tipranavir / ritonavir, which are HIV 1 protease inhibitors, produce little or no change in rosuvastatin exposure. Caution should be exercised when rosuvastatin is coadministered with protease inhibitors.

Coumarin Anticoagulants: Rosuvastatin significantly increased INR in patients receiving coumarin anticoagulants. Therefore, caution should be exercised when coumarin anticoagulants are given in conjunction with Rosuvastatin. In patients taking coumarin anticoagulants and Rosuvastatin concomitantly, INR should be determined before starting Rosuvastatin and frequently enough during early therapy to ensure that no significant alteration of INR occurs.

Niacin: The risk of skeletal muscle effects may be enhanced when Rosuvastatin is used in combination with lipid-modifying doses (>1 g/day) of niacin; caution should be used when prescribing with Rosuvastatin.

Fenofibrate: When Rosuvastatin was coadministered with fenofibrate, no clinically significant increase in the AUC of rosuvastatin or fenofibrate was observed. Because it is known that the risk of myopathy during treatment with statins is increased with concomitant use of fenofibrates, caution should be used when prescribing fenofibrates with Rosuvastatin.

Colchicine: Cases of myopathy, including rhabdomyolysis, have been reported with statins, including rosuvastatin, coadministered with colchicine, and caution should be exercised when prescribing Rosuvastatin with colchicine

Volume of Distribution

Rosuvastatin undergoes first-pass extraction in the liver, which is the primary site of cholesterol synthesis and LDL-C clearance. The mean volume of distribution at steady-state of rosuvastatin is approximately 134 litres.

Elimination Route

In a study of healthy white male volunteers, the absolute oral bioavailability of rosuvastatin was found to be approximately 20% while absorption was estimated to be 50%, which is consistent with a substantial first-pass effect after oral dosing. Another study in healthy volunteers found that the peak plasma concentration (Cmax) of rosuvastatin was 6.06ng/mL and was reached at a median of 5 hours following oral dosing. Both Cmax and AUC increased in approximate proportion to dose. Neither food nor evening versus morning administration was shown to have an effect on the AUC of rosuvastatin. Many statins are known to interact with hepatic uptake transporters and thus reach high concentrations at their site of action in the liver.

Breast Cancer Resistance Protein (BCRP) is a membrane-bound protein that plays an important role in the absorption of rosuvastatin, particularly as CYP3A4 has minimal involvement in its metabolism. Evidence from pharmacogenetic studies of c.421C>A single nucleotide polymorphisms (SNPs) in the gene for BCRP has demonstrated that individuals with the 421AA genotype have reduced functional activity and 2.4-fold higher AUC and Cmax values for rosuvastatin compared to study individuals with the control 421CC genotype. This has important implications for the variation in response to the drug in terms of efficacy and toxicity, particularly as the BCRP c.421C>A polymorphism occurs more frequently in Asian populations than in Caucasians. Other statin drugs impacted by this polymorphism include fluvastatin and atorvastatin.

Genetic differences in the OATP1B1 (organic-anion-transporting polypeptide 1B1) hepatic transporter have also been shown to impact rosuvastatin pharmacokinetics. Evidence from pharmacogenetic studies of the c.521T>C SNP showed that rosuvastatin AUC was increased 1.62-fold for individuals homozygous for 521CC compared to homozygous 521TT individuals. Other statin drugs impacted by this polymorphism include simvastatin, pitavastatin, atorvastatin, and pravastatin.

For patients known to have the above-mentioned c.421AA BCRP or c.521CC OATP1B1 genotypes, a maximum daily dose of 20mg of rosuvastatin is recommended to avoid adverse effects from the increased exposure to the drug, such as muscle pain and risk of rhabdomyolysis.

Half Life

The elimination half-life (t½) of rosuvastatin is approximately 19 hours and does not increase with increasing doses.

Elimination Route

Rosuvastatin is not extensively metabolized; approximately 10% of a radiolabeled dose is recovered as metabolite. Following oral administration, rosuvastatin and its metabolites are primarily excreted in the feces (90%). After an intravenous dose, approximately 28% of total body clearance was via the renal route, and 72% by the hepatic route.

A study in healthy adult male volunteers found that approximately 90% of the rosuvastatin dose was recovered in feces within 72 hours after dose, while the remaining 10% was recovered in urine. The drug was completely excreted from the body after 10 days of dosing. They also found that approximately 76.8% of the excreted dose was unchanged from the parent compound, with the remaining dose recovered as the metabolites n-desmethyl rosuvastatin and rosuvastatin-5S-lactone.

Renal tubular secretion is responsible for >90% of total renal clearance, and is believed to be mediated primarily by the uptake transporter OAT3 (Organic anion transporter 1), while OAT1 had minimal involvement.

Pregnancy & Breastfeeding use

Pregnancy Category X. Teratogenic effects. Rosuvastatin is contraindicated in pregnancy and lactation. Women of child bearing potential should use appropriate contraceptive measures. If a patient becomes pregnant during use of this product, treatment should be discontinued immediately.

Rosuvastatin is excreted in the milk of rats. There are no data with respect to excretion in milk in humans

Contraindication

Rosuvastatin is contraindicated:

• In patients with hypersensitivity to rosuvastatin or to any of the excipients.
• In patients with active liver disease including unexplained, persistent elevations of serum transaminases and any serum transaminase elevation exceeding 3 x the upper limit of normal (ULN).
• In patients with severe renal impairment (creatinine clearance < mL/minute/1.73m2).
• In patients with myopathy.
• In patients receiving concomitant cyclosporine.
• During pregnancy and lactation and in women of childbearing potential not using appropriate contraceptive measures.

Special Warning

Age and sex: There was no clinically relevant effect of age or sex on the pharmacokinetics of Rosuvastatin in adults.

Race: Pharmacokinetic studies show an increase in exposure in Asian subjects compared with Caucasians.

Severe renal impairment (not on hemodialysis): Starting dose is 5 mg, not to exceed 10 mg

Use in the elderly: Patients > 70 years: A start dose of 5 mg is recommended. No dose adjustment necessary.

Renal insufficiency: Initially 5mg once daily (do not exceed 20mg daily) if eGFR is 30–60 mL/ minute/ 1.73 m2. Avoid if eGFR is less than 30 mL /minute/ 1.73 m2.

Genetic polymorphisms: Specific types of genetic polymorphisms are known that can lead to increased rosuvastatin exposure. For patients who are known to have such specific types of polymorphisms, a lower daily dose of Rosuvastatin is recommended.

Dosage in patients with pre-disposing factors to myopathy: The recommended starting dose is 5 mg in patients with predisposing factors to myopathy. The 40 mg dose is contraindicated in some of these patients.

Acute Overdose

There is no specific treatment in the event of overdose. In the event of overdose, the patient should be treated symptomatically and supportive measures instituted as required. Haemodialysis is unlikely to be of benefit.

Storage Condition

Keep out of the reach of children. Store below 30° C. Keep in the original package in a cool & dry place in order to protect from light and moisture.

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