Rosuvastatin (Crestor) is generally well-tolerated, but several prescription drugs, supplements, and even some over-the-counter products can interact with it in ways that raise your risk of muscle damage or reduce the medication’s effectiveness. The most serious concern is a rare but dangerous condition called rhabdomyolysis, where muscle tissue breaks down and releases proteins that can damage the kidneys. Knowing what to avoid, and what simply requires a dose adjustment, can help you take rosuvastatin safely.
Cyclosporine and Gemfibrozil
These are two of the most significant interactions. Cyclosporine, an immune-suppressing drug used after organ transplants and for certain autoimmune conditions, increases rosuvastatin levels in the blood by roughly sevenfold. That dramatic spike raises the risk of serious muscle toxicity. If the combination is unavoidable, the daily rosuvastatin dose is typically capped at just 5 mg.
Gemfibrozil, a cholesterol-lowering medication in the fibrate class, also raises rosuvastatin concentrations by about 1.6 to 1.9 times normal levels. The FDA-approved labeling for rosuvastatin recommends avoiding gemfibrozil altogether. When the two absolutely must be used together, the rosuvastatin dose is limited to 10 mg daily. If you need a fibrate alongside rosuvastatin, fenofibrate is generally considered a safer pairing because it works through a different metabolic pathway.
Hepatitis C Antivirals
Several medications used to treat hepatitis C significantly boost rosuvastatin levels in the body. Two combinations are not recommended at all with rosuvastatin:
- Sofosbuvir/velpatasvir/voxilaprevir
- Ledipasvir/sofosbuvir
Other hepatitis C treatments can be used with rosuvastatin, but only at reduced doses (starting at 5 mg, with a maximum of 10 mg daily). These include regimens containing simeprevir, elbasvir/grazoprevir, glecaprevir/pibrentasvir, and sofosbuvir/velpatasvir without voxilaprevir. If you’re starting hepatitis C treatment while on rosuvastatin, your prescriber will need to adjust your statin dose or temporarily switch you to a different cholesterol medication.
HIV Medications
Certain HIV protease inhibitor combinations also raise rosuvastatin blood levels enough to require dose limits. Both atazanavir/ritonavir and lopinavir/ritonavir require that rosuvastatin be started at 5 mg and kept at or below 10 mg daily. The ritonavir component in these regimens is the main driver of the interaction, as it slows the body’s clearance of rosuvastatin.
Paxlovid Is Not a Concern
Paxlovid, the antiviral used for COVID-19, also contains ritonavir, which initially raised questions about a rosuvastatin interaction. However, updated prescribing information from September 2024 confirmed that Paxlovid does not cause a clinically relevant interaction with rosuvastatin. You do not need to pause or adjust your rosuvastatin dose during a course of Paxlovid.
Colchicine and Muscle Damage Risk
Colchicine, commonly prescribed for gout flares and increasingly used for heart disease, carries its own risk of muscle toxicity. When combined with rosuvastatin, the risk of rhabdomyolysis appears to increase. An analysis of FDA adverse event reports found a potential safety signal for rhabdomyolysis when colchicine was used alongside rosuvastatin or atorvastatin. This interaction is notable because rosuvastatin is not broken down by the same liver enzyme (CYP3A4) that typically drives statin interactions, suggesting a different mechanism is at play. If you take both medications, watch for unexplained muscle pain, weakness, or dark-colored urine, which are warning signs of muscle breakdown.
Warfarin and Blood Thinning
Rosuvastatin can alter the effect of warfarin, a blood thinner with a very narrow margin between a therapeutic dose and a dangerous one. Starting rosuvastatin, changing the dose, or stopping it can shift your INR (the lab value that measures how quickly your blood clots). This doesn’t mean you can’t take both, but your INR will need closer monitoring whenever your rosuvastatin regimen changes. Other statins, including atorvastatin and simvastatin, carry the same caution. If you’re on warfarin, your prescriber will likely check your INR more frequently during the transition period.
Antacids Containing Aluminum or Magnesium
Over-the-counter antacids like Maalox that contain aluminum and magnesium can reduce rosuvastatin absorption if taken at the same time. The fix is simple: take the antacid at least two hours after your rosuvastatin dose. This gives the statin enough time to be absorbed before the antacid interferes. Calcium-based antacids like Tums do not have the same interaction.
Grapefruit: Not a Problem With Rosuvastatin
If you’ve heard that grapefruit and statins don’t mix, here’s some good news. That warning applies mainly to atorvastatin, lovastatin, and simvastatin, which are broken down by a liver enzyme that grapefruit blocks. Rosuvastatin is processed differently. According to Cleveland Clinic, grapefruit appears to have little to no interaction with rosuvastatin, pravastatin, pitavastatin, or fluvastatin. You don’t need to avoid grapefruit or grapefruit juice while taking rosuvastatin.
Supplements and Herbal Products
Red yeast rice is a supplement marketed for cholesterol management, but it naturally contains monacolin K, which is chemically identical to the active ingredient in lovastatin. Taking it alongside rosuvastatin essentially means doubling up on statin-type compounds, which increases the likelihood of muscle side effects without any controlled dosing.
Green tea in large quantities has been linked to muscle complaints in people taking statins, including rosuvastatin. One documented case involved a man who experienced leg cramps on multiple statins, all while drinking about three cups of green tea daily. The interaction isn’t well-established enough to warrant a blanket warning, but if you drink green tea regularly and notice new muscle soreness after starting rosuvastatin, it’s worth mentioning to your prescriber.
Alcohol and Liver Health
You can drink alcohol while taking rosuvastatin, but heavy drinking increases your risk of both muscle and liver side effects. The NHS recommends keeping alcohol intake within 14 units per week (roughly six pints of beer or six medium glasses of wine). During the first 12 months on rosuvastatin, you’ll typically have routine blood tests to check that your liver enzymes stay within a healthy range. Drinking heavily during this period makes abnormal results more likely and could lead to your medication being paused or stopped.
Risk Factors That Amplify Interactions
Certain characteristics make you more vulnerable to muscle problems from any rosuvastatin interaction. These include older age, being female, having an underactive thyroid, low muscle mass, and engaging in intense physical activity. Higher statin doses also carry greater risk. If several of these factors apply to you and you’re taking any of the medications listed above, the threshold for muscle toxicity is lower, and even mild interactions become more clinically meaningful.