Simvastatin oral
- Drugs List
- Therapeutic Indications
- Dosage
- Contraindications
- Precautions and Warnings
- Pregnancy and Lactation
- Side Effects
- Monograph
Presentation
Oral formulations of simvastatin.
Drugs List
Therapeutic Indications
Uses
Combined hyperlipidaemia: lipid lowering therapy adjunct to diet
Coronary heart disease: Reduce risk of morbidity/mortality
Diabetes mellitus: Reduce cardiovascular morbidity/mortality
Heterozygous familial hypercholesterolaemia: Adjunct to diet
Homozygous familial hypercholesterolaemia: reduction of cholesterol
Treatment of primary hypercholesterolaemia resistant to diet
Adjunctive treatment of primary hypercholesterolaemia or mixed dyslipidaemia with dietary measures when response to diet and other non-pharmacological treatments (e.g. exercise and weight reduction) is inadequate.
Adjunctive treatment of homozygous familial hypercholesterolaemia with diet and other lipid lowering treatments (e.g. LDL apheresis) or if such treatments are not appropriate.
Reduction of cardiovascular mortality and morbidity as an adjunct to correction of other risk factors and cardioprotective therapy, in patients with manifest atherosclerotic cardiovascular disease or diabetes mellitus with normal or increased cholesterol levels.
Dosage
Patients should be placed on a standard cholesterol-lowering diet before receiving simvastatin and should continue on this diet during treatment.
Adults
Prevention of cardiovascular event
20mg to 40mg daily, given as a single dose in the evening in patients at high risk of coronary heart disease with or without hyperlipidaemia.
Adjustments of dosage, if required, should be made at intervals of not less than four weeks.
Maximum dose: 80mg daily. This dose is only recommended in patients with severe hypercholesterolaemia and high risk for cardiovascular complication who have not achieved their treatment goals on lower doses and when benefits are expected to outweigh the potential risks.
Hypercholesterolaemia
Initial dose: 10mg to 20mg once a day in the evening. Patients requiring a large reduction in LDL-cholesterol (greater than 45%) may be started on 20mg to 40mg once daily. A dose of 5mg daily in combination with non-pharmacological measures (e.g. exercise, diet and weight reduction) may be suitable for patients with less severe hypercholesterolaemia.
Adjustments of dosage, if required, should be made at intervals of not less than four weeks.
Maximum dose: 80mg daily. This dose is only recommended in patients with severe hypercholesterolaemia and high risk for cardiovascular complication who have not achieved their treatment goals on lower doses and when benefits are expected to outweigh the potential risks.
Homozygous familial hypercholesterolaemia
40mg daily, taken as a single dose in the evening.
Simvastatin should be used as an adjunct to other lipid lowering treatments (e.g. LDL apheresis) in these patients or if such treatments are unavailable.
The following alternative dosing schedule may be suitable:
Initial dose: 40mg once daily at night. Adjust at intervals of at least four weeks.
Maximum dose: 80mg once daily at night.
Children
Heterozygous familial hypercholesterolaemia:
Children aged 10 to 18 years (boys Tanner Stage II and above, and girls who are at least one year post-menarche)
Initial dose: 10mg once daily in the evening.
Maintenance dose: 10mg to 40mg daily. Doses should be individualised according to the recommended goal of therapy as recommended by the paediatric treatment recommendations. Adjustments should be made at intervals of four weeks or more. The experience of simvastatin in pre-pubertal children is limited.
Hyperlipidaemia including familial hypercholesterolaemia
Children aged 5 to 10 years (unlicensed)
Initial dose: 10mg once daily in the evening. Increase at intervals of at least four weeks if necessary.
Maximum dose: 20mg once daily in the evening.
Patients with Renal Impairment
Adult
In patients with severe renal insufficiency (creatinine clearance below 30ml/minute), dosages above 10mg/day should be implemented cautiously.
The Renal Drug Handbook suggests the following doses:
GFR 20 to 50ml/minute: Dose as in normal renal function
GFR 10 to 20ml/minute: Dose as in normal renal function
Less than 10ml/minute: 10mg to 20mg daily. In severe renal impairment doses above 10mg should be used with caution (doses up to 40mg daily have been used).
Patients with Hepatic Impairment
Simvastatin is contraindicated in patients with severe hepatic impairment, active liver disease or unexplained persistent elevations in serum transaminases.
Contraindications
Children under 5 years
Creatine kinase levels over 5 times upper limit of normal
Within 7 days of discontinuing fusidic acid
Breastfeeding
Myopathy
Pregnancy
Serum transaminases above 3 times upper limit of normal
Severe hepatic impairment
Unexplained elevated serum transaminases
Precautions and Warnings
Asian ancestry
Children aged 5 to 10 years
Family history of hereditary muscular disorders
Females of childbearing potential
High alcohol intake
Major surgery
Patients over 65 years
Severe trauma
Galactosaemia
Glucose-galactose malabsorption syndrome
Hereditary muscular disorder
History of hepatic impairment
History of muscular toxicity secondary to fibrates
History of muscular toxicity secondary to HMG-CoA reductase inhibitors
History of non-traumatic rhabdomyolysis
Hypothyroidism
Lactose intolerance
Renal impairment - creatinine clearance below 30 ml/minute
Advise ability to drive/operate machinery may be affected by side effects
Correct hypothyroidism before treatment
Exclude secondary causes of hypercholesterolaemia before treatment
Not all available brands are licensed for all age groups
Not all available brands are licensed for all indications
Some formulations contain lactose
Measure creatine kinase levels prior to treatment if risk of rhabdomyolysis
Perform liver function tests before commencing therapy
Monitor blood glucose in high risk patients
Monitor creatine kinase levels in patients at risk of rhabdomyolysis
Monitor creatine kinase levels in patients reporting myalgia
Repeat liver function tests within 3 months and at 12 months
Advise patient to report any symptoms of interstitial lung disease
Advise patients to report muscle pain/tenderness/weakness
Advise patients to report signs of hepatic damage (malaise, jaundice etc.)
Discontinue if jaundice or other clinical symptoms of hepatic injury
Discontinue if myopathy is suspected
Advise patient to seek advice at first indications of pregnancy
Discontinue if ALT level exceed 3 times the upper limit of normal & persist
Discontinue if AST level exceed 3 times the upper limit of normal & persist
Discontinue if creatine kinase levels >5 times upper limit of normal
Discontinue if evidence of interstitial lung disease
Discontinue if muscular symptoms are severe
Discontinue prior to surgery
Advise patient grapefruit products may increase plasma level
Dietary restrictions should be maintained
Female: Contraception required during and for 3 months after treatment
Statin therapy has been associated with the development of myalgia, myopathy and rhabdomyolysis, which can rarely be fatal. Myopathy is dose related.
Routine monitoring of creatinine kinase is not necessary in asymptomatic patients.
Do not measure creatine kinase levels following strenuous exercise or in the presence of other factors affecting CK levels. If CK is greater than 5 times the upper limit of normal (ULN) levels prior to treatment, re-measure 5 to 7 days later.
If symptoms of myopathy resolve and levels of creatinine kinase reduce, treatment can be reinitiated at the lowest dose and with close monitoring.
Cases of interstitial lung disease have been reported with some statins, especially in long-term therapy. If the patient presents with signs or symptoms of interstitial lung disease including dyspnoea, non-productive cough, or deterioration of general health (fatigue, weight loss, fever), treatment should be discontinued.
Some evidence suggests that statins as a class raise blood glucose and in some patients, at a high risk of future diabetes, may produce a level of hyperglycaemia where formal diabetes care is appropriate. This risk, however, is outweighed by the reduction in vascular risk with statins and therefore should not be a reason for stopping statin treatment. Patients at risk (raised fasting glucose, raised body mass index at baseline, history of hypertension and raised triglycerides)should be monitored both clinically and biochemically according to national guidelines.
Rare cases of myopathy/rhabdomyolysis have been associated with concomitant administration of HMG-CoA reductase inhibitors and lipid-modifying doses (greater than or equal to 1g/day) of niacin (nicotinic acid), either of which can cause myopathy when given alone.
Coadministration of simvastatin with lipid-modifying doses (greater than or equal to 1g/day) of niacin (nicotinic acid) is not recommended in Asian patients.
There have been very rare reports of an immune mediated necrotizing myopathy (IMNM) during or after treatment with some statins. IMNM is clinically characterised by persistent proximal muscle weakness and elevated serum creatine kinase, which persist despite discontinuation of statin treatment.
The risk of myopathy is greater on simvastatin 80mg and should only be used in patients with severe hypercholesterolaemia and at high risk for cardiovascular complications. If an interacting agent is needed, an alternative statin based regimen with less potential for drug-drug interactions should be used.
Patients carrying the SLC01B1 gene allele (c.521T>C) have an increased systemic exposure of simvastatin and increased risk of myopathy. Where available, genotyping for the presence of the C allele should be considered prior to prescribing high dose simvastatin and high doses avoided in patients with the CC genotype.
If serious liver injury with clinical symptoms and/or hyperbilirubinaemia or jaundice occurs during treatment with simvastatin, promptly interrupt therapy. If an alternate etiology is not found, do not restart treatment.
Pregnancy and Lactation
Pregnancy
Simvastatin is contraindicated during pregnancy.
A mixture of human malformations have been reported with the used of statins in the first trimester, these include; VATER-association, neural tube defects, holoprosencephaly, other CNS malformations and limb abnormalities (Schaefer, 2007). None of these malformations have occurred in significant enough quantities to enable causality to be concluded. However, the theoretical risks of reducing cholesterol availability during embryo development should be considered since simvastatin may reduce the foetal levels of mevalonate which is a precursor of cholesterol biosynthesis. The suspension of treatment throughout pregnancy is not considered likely to have a detrimental effect on the long term course of hyperlipidaemia. For these reasons simvastatin should not be used during pregnancy. Schaefer (2007) concludes that inadvertent treatment with a statin during pregnancy, does not require a termination of pregnancy, however, treatment should be stopped immediately and a detailed ultrasound examination should considered.
Advise female patients of child bearing potential to take adequate contraceptive measures during treatment and for three months after discontinuation (NICE guideline no.71).
The use of all medication in pregnancy should be avoided whenever possible; particularly in the first trimester. Non-drug treatments should also be considered. When essential, a medication with the best safety record over time should be chosen, employing the lowest effective dose for the shortest possible time. Polypharmacy should be avoided. Teratogens taken in the pre-embryonic period, often quoted as lasting until 14-17 days post-conception, are believed to have an all-or-nothing effect. Where drugs have a short half-life, and when the date of conception is certain, this may allow women to be reassured where drug exposure has occurred within this time frame. Further advice may be available from the UK National Teratology Information Service (NTIS) and through ToxBase, available via password on the internet ( www.toxbase.org ) or if this is unavailable at the backup site ( www.toxbasebackup.org ).
Licensed in pregnancy? - No, contraindicated
Recommended for use in pregnancy? - No
Effects on foetus - VATER-association, neural tube defects, holoprosencephaly, other CNS malformations and limb abnormalities have been reported following the use of statins.
Lactation
Simvastatin is contraindicated while breastfeeding.
At the time of writing, there is little published experience concerning the use of statins during breastfeeding. Due to the possible inhibition of cholesterol biosynthesis by statins, there is a theoretical risk posed to the neonate. The products of cholesterol biosynthesis, including cholesterol are essential for neonatal development. Therefore, the use of statins is contraindicated while breastfeeding. The suspension of treatment while breastfeeding is not considered likely to detrimentally affect the long term course of hyperlipidaemia, therefore simvastatin use during breastfeeding is not recommended.
Neonates, infants born prematurely, those with low birth weight, those with an unstable gastrointestinal function or who have serious illnesses may require special consideration. For any infant, if a drug is prescribed to the nursing mother, it should be at the lowest practical dose and for the shortest time. When drug administration is unavoidable and breastfeeding is to continue, minimisation of exposure of the infant to the drug may sometimes be achieved by timing the maternal doses to just after a feeding episode. Infants exposed to drugs via breast milk should be monitored for unusual signs or symptoms. Interactions between the drug received by the infant from the mother's milk and medication prescribed for the infant should also be considered, for example, when the drug given to the infant may prevent metabolism of the drug received via breast milk.
Specialist advice is available from the UK Drugs in Lactation Advisory Service at https://www.midlandsmedicines.nhs.uk/content.asp?section=6&subsection=17&pageIdx=1 is contraindicated while breastfeeding.
Side Effects
Abdominal pain
Accelerated erythrocyte sedimentation
Acute renal failure
Alopecia
Altered liver function tests
Amnesia
Anaemia
Anaphylaxis
Angioedema
Arthralgia
Arthritis
Asthenia
Confusion
Constipation
Cough
Creatine phosphokinase increased
Depression
Dermatomyositis
Diarrhoea
Dizziness
Dyspepsia
Dyspnoea
Eosinophilia
Erectile dysfunction
Fatigue
Fever
Flatulence
Flushing
Forgetfulness
Gastro-intestinal disturbances
Headache
Hepatic failure
Hepatitis
Hypersensitivity reactions
Immune mediated necrotizing myopathy
Impaired memory
Increase in alkaline phosphatase
Increase in serum ALT/AST
Increased fasting blood glucose
Increased glycated haemoglobin (HbA1c) levels
Insomnia
Interstitial lung disease
Jaundice
Lupus erythematosus-like syndrome
Malaise
Muscle weakness
Muscular cramps
Myalgia
Myopathy
Myositis
Nausea
Nightmares
Pancreatitis
Paraesthesia
Peripheral neuropathy
Photosensitivity
Polymyalgia rheumatica
Precipitation of diabetes
Pruritus
Rash
Rhabdomyolysis
Sexual dysfunction
Sleep disturbances
Tendinopathy
Tendon rupture
Thrombocytopenia
Urticaria
Vasculitis
Visual disturbances
Vomiting
Weight loss
Overdosage
It is strongly recommended that the UK National Poisons Information Service be consulted on cases of suspected or actual overdose where there is doubt over the degree of risk or about appropriate management.
The following number will direct the caller to the relevant local centre (0844) 892 0111
Information may be obtained if you have access to ToxBase the primary clinical toxicology database of the National Poisons Information Service. This is available via password on the internet ( www.toxbase.org ) or if this is unavailable at the backup site ( www.toxbasebackup.org ).
Further Information
Last Full Review Date: February 2013
Reference Sources
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