Rosuvastatin (Crestor): How It Works, Uses, Dosage, Side Effects and Complete 2026 Guide
Rosuvastatin, sold as Crestor and widely available as a generic, is one of the most commonly prescribed cholesterol-lowering medicines in the United States. It belongs to the statin family and is among the most potent of them, which is why doctors often choose it when a large LDL ("bad") cholesterol reduction is needed, or when a patient takes other medicines that interact with atorvastatin.
Statins are well studied and prevent heart attacks and strokes in people at risk, but they work best when taken correctly and monitored sensibly. The FDA revised the Crestor prescribing information in April 2026, so this guide reflects the current label: the dose range, who should start low, which medicines need dose limits, how to recognize muscle problems, and what to do about common questions such as timing and antacids.
If you are comparing statins, read our companion guide: [Atorvastatin (Lipitor): Complete Statin Guide 2026]
How Rosuvastatin Works
The liver makes most of the cholesterol in your body using an enzyme called HMG-CoA reductase. Rosuvastatin blocks that enzyme. With less cholesterol being made, the liver pulls more LDL particles out of the bloodstream, and LDL levels fall. Statins also modestly lower triglycerides and slightly raise HDL ("good") cholesterol, and they appear to calm inflammation inside artery walls.
Compared with atorvastatin, rosuvastatin is processed differently by the body. It relies much less on the CYP3A4 liver enzyme, so it has fewer interactions with drugs and foods that affect that enzyme, such as grapefruit juice. It has its own set of interactions, which are covered below.
What Rosuvastatin Is Used For
Rosuvastatin is a prescription statin used, alongside diet, to:
Reduce the risk of major cardiovascular events such as heart attack and stroke in appropriate adults
Lower LDL cholesterol in adults with high cholesterol (hyperlipidemia)
Treat hypertriglyceridemia (high triglycerides) and primary dysbetalipoproteinemia in adults
Lower LDL cholesterol in children and teenagers with familial hypercholesterolemia, a genetic condition, at the ages and doses set out in the label (heterozygous from age 8, homozygous from age 7)
The treatment goal depends on your overall risk, not just your cholesterol number. Your clinician will consider age, blood pressure, diabetes, smoking, family history and previous heart or stroke events.
Dosage and How to Take It
Situation | Dosing from the current prescribing information |
Adults | Dose range is 5 to 40 mg once daily; the recommended dose depends on the indication, your LDL cholesterol and your risk of cardiovascular events |
Asian patients | Start at 5 mg once daily because blood levels are higher; the label advises weighing risks and benefits if cholesterol is not controlled at doses up to 20 mg |
Severe kidney impairment (not on dialysis) | Start at 5 mg once daily; do not exceed 10 mg once daily |
Mild to moderate kidney impairment | No adjustment is recommended |
Children and teenagers with familial hypercholesterolemia | Lower, age-based dosing set by a specialist |
Practical points:
Rosuvastatin is taken by mouth once daily. The labeling says it can be taken at any time of day, with or without food, which helps with remembering it.
Cholesterol should usually be re-checked as early as 4 weeks after starting, so the dose can be adjusted if needed.
The 40 mg dose carries the highest risk of muscle problems, so doctors generally use it only when needed.
Higher-intensity statin treatment, which in American guidelines includes rosuvastatin 20 to 40 mg, lowers LDL by roughly half or more, and moderate intensity (5 to 10 mg) by roughly 30 to 49 percent.
Statins work only while you take them. LDL returns to its earlier level after stopping.
Do not stop without advice, because the benefit to your heart depends on continuing treatment.
Side Effects
Most people take rosuvastatin without problems. Common effects include:
Muscle aches or weakness (usually mild)
Headache
Nausea, constipation or abdominal pain
Dizziness or tiredness
Less common but important:
Myopathy and rhabdomyolysis: This is the key safety issue with statins. Myopathy is muscle injury, and rhabdomyolysis is a severe form that can damage the kidneys. The label says the risks can occur at any dose but are higher at 40 mg.
Liver enzyme rises, which are usually mild and often temporary. Your doctor may check liver tests if symptoms suggest a problem.
Blood sugar: Statins can slightly raise blood sugar in some people. For most people at risk of heart disease, the cardiovascular benefit outweighs this.
Rare effects include memory complaints, allergic reactions and an immune-mediated muscle condition.
Muscle Problems: Who Is at Risk and What to Watch For
The label lists these risk factors for myopathy and rhabdomyolysis:
Age 65 or older
Hypothyroidism that is not well treated
Kidney impairment
Taking certain other medicines
Higher rosuvastatin doses
Asian ancestry, which is associated with higher blood levels
Report promptly any unexplained muscle pain, tenderness or weakness, particularly if you also feel unwell or have a fever, dark or cola-colored urine, or much less urine than usual. Your doctor may check a blood marker called creatine kinase (CK) and stop the statin if muscle injury is suspected.
The label also advises temporarily withholding rosuvastatin during an acute serious illness that could lead to kidney failure from muscle breakdown, such as sepsis, very low blood pressure, severe dehydration or major surgery. If you become seriously ill, make sure the treating team knows you take a statin.
If you have a thyroid condition, getting it properly treated also lowers statin muscle risk. See: [Levothyroxine (Synthroid): Complete Hypothyroidism Guide]()
Important Interactions
Medicine | What the label says | What to do |
Cyclosporine | Do not exceed 5 mg once daily | Needs specialist oversight |
Gemfibrozil | Avoid if possible; if used, start at 5 mg and do not exceed 10 mg once daily | Ask about alternatives |
Hepatitis C combinations (sofosbuvir/velpatasvir/voxilaprevir, ledipasvir/sofosbuvir) | Avoid concomitant use | Your prescriber may pause the statin during treatment |
Darolutamide (prostate cancer) | Do not exceed 5 mg once daily | Tell your oncology team |
Other listed medicines (for example teriflunomide, regorafenib, febuxostat and some others) | Dose caps apply | Share your full medicine list with your pharmacist |
Colchicine | Muscle problems have been reported; use caution | Report muscle symptoms |
Aluminum and magnesium hydroxide antacids | They can reduce absorption | Take rosuvastatin at least 2 hours before the antacid |
Warfarin | Statins can change INR | Have INR checked when starting or changing the dose |
For people being treated for hepatitis C, see: [Hepatitis C: Direct-Acting Antivirals and Cure Guide]
Pregnancy and Breastfeeding
Breastfeeding is not recommended during treatment with rosuvastatin. Statins have long been avoided in pregnancy, because cholesterol is needed for fetal development. In 2021 the FDA removed the blanket contraindication in pregnancy but still advises that most pregnant patients should stop statins. If you are pregnant, planning pregnancy or breastfeeding, talk to your doctor before taking or stopping any statin.
Rosuvastatin Compared With Atorvastatin
Feature | Rosuvastatin | Atorvastatin |
Potency at top doses | Very high | High |
CYP3A4 reliance | Minimal | Significant |
Grapefruit juice interaction | Not a typical concern | Relevant in large amounts |
Amlodipine interaction | Not a typical concern | Atorvastatin can be used, but dose reviews apply |
Kidney considerations | Dose cap in severe kidney impairment | Generally no kidney adjustment |
Asian patients | Start at 5 mg | No special starting dose |
Hepatitis C antivirals | Avoid certain combinations | Certain combinations also need review |
Often chosen when | A strong LDL reduction is needed, or CYP3A4 interactions are a concern | Wide experience, or kidney impairment is present |
Our guide to the blood pressure medicine often taken with statins: [Amlodipine (Norvasc) Complete Guide]
Lifestyle: What Still Matters on a Statin
A statin is not a license to ignore diet and activity. Aim for regular exercise, a heart-healthy eating pattern, a healthy weight, no smoking, and good control of blood pressure and blood sugar. Our guide to blood pressure and the related medicines: [High Blood Pressure (Hypertension): Complete Guide] and [Losartan (Cozaar) Complete Guide]
When to Get Medical Help
Seek urgent care for severe muscle pain with weakness, dark urine, fever, yellowing of the skin or eyes, severe stomach pain, or signs of an allergic reaction such as swelling of the face or throat. Contact your clinician if muscle aches persist, if you start a new medicine, or if you become pregnant.
The current FDA prescribing information is available at: https://www.accessdata.fda.gov/drugsatfda_docs/label/2026/021366Orig1s047correctedlbl.pdf
The generic rosuvastatin label, updated August 7, 2026, is available at: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=392657a9-955c-42c2-814c-1890ece45afa
A summary of Crestor dosing is available at: https://www.rxlist.com/crestor-drug.htm
Frequently Asked Questions
What is rosuvastatin used for?
Rosuvastatin is a statin used with diet to lower LDL cholesterol, to treat high triglycerides and primary dysbetalipoproteinemia, and to reduce the risk of heart attacks, strokes and other cardiovascular events in appropriate adults. It is also used in children and teenagers with familial hypercholesterolemia under specialist care.
What is the usual dose of rosuvastatin?
The adult dose range is 5 to 40 mg once daily, chosen according to your cholesterol, risk and the reason you are treated. Asian patients should start at 5 mg, and people with severe kidney impairment not on dialysis should start at 5 mg and not exceed 10 mg. Cholesterol is usually rechecked as early as 4 weeks after starting.
When is the best time to take rosuvastatin?
According to the labeling, rosuvastatin can be taken at any time of day, with or without food. The most important thing is to take it consistently. If you use an aluminum or magnesium hydroxide antacid, take rosuvastatin at least 2 hours before the antacid.
What are the signs of serious statin muscle problems?
Report unexplained muscle pain, tenderness or weakness, especially with fever, general malaise, dark or cola-colored urine, or reduced urine output. Risk is higher at 40 mg, with age 65 or older, poorly treated hypothyroidism, kidney impairment, Asian ancestry, and with certain interacting medicines. Your doctor can check creatine kinase and stop the statin if needed.
Which medicines should not be combined with rosuvastatin?
The label says to avoid the hepatitis C combinations sofosbuvir/velpatasvir/voxilaprevir and ledipasvir/sofosbuvir, and to avoid gemfibrozil where possible, using no more than 10 mg if it is unavoidable. Cyclosporine limits the dose to 5 mg, and darolutamide also limits it to 5 mg. Several other medicines have dose caps, so always give your pharmacist your full medicine list.
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