For most people, starting a statin is uneventful. You take a tablet once a day, have a blood test some weeks later to see how far your LDL cholesterol has fallen, and feel no different.
The first few months are mainly about two questions: is the medication lowering your LDL cholesterol as much as intended, and are you tolerating it?
Key takeaways
- US guidance has called for a repeat cholesterol test 4 to 12 weeks after a statin is started or its dose is changed.
- Response is judged by the percentage drop in LDL cholesterol from your starting value, and it varies between people.
- In blinded trials, muscle aches were reported nearly as often on placebo as on a statin.
- Statins slightly raise the chance of a diabetes diagnosis, mostly in people whose blood sugar was already near the threshold.
- Report any symptom to your prescriber, and keep taking the tablet unless they tell you otherwise.
Before the first tablet
Your prescriber will already have a baseline cholesterol test. Keep a copy of it. Your response is measured against that starting number, so it stays useful for years.
Give your prescriber a full list of what you take, including over-the-counter products and supplements. Some supplements contain active compounds, as explained in our article on supplements for cholesterol.
It also helps to notice how you feel now. If you already have a stiff shoulder or sore knees, write it down. A record of your usual aches makes it easier to judge anything new later.
The first follow-up blood test
The 2018 US cholesterol guideline advised a repeat lipid test 4 to 12 weeks after starting a statin or changing the dose, and then every 3 to 12 months as needed.1 That guideline has since been replaced by a 2026 update, so your prescriber may set a slightly different schedule.
The guideline describes the test as a check on two things at once: your response to the dose and how consistently you are taking it.
If the result falls short, the usual options are a dose change, a different statin or an added medication. Those are your prescriber's decisions to make with you. Our guide on how low LDL should go explains how goals are set.
How much your LDL cholesterol should fall
Statin treatment comes in intensities. The 2018 guideline states that moderate-intensity statin therapy typically lowers LDL cholesterol by 30% to 49%, and high-intensity therapy by 50% or more.1 It also notes that the actual response varies in practice.
Trial data show how wide that variation is. In a trial of 17,082 adults, 46.3% of those assigned to a high-intensity statin had an LDL cholesterol reduction of 50% or more, 42.8% had a smaller reduction, and 10.8% had no reduction or an increase.2
In the same analysis, larger percentage reductions went with fewer first cardiovascular events. So a weak response is worth following up. It may reflect missed doses, your own biology, or both.
How you are likely to feel
Most people feel nothing. The symptom people worry about most is muscle aching, and it is the one with the best data.
In 19 placebo-controlled trials with 123,940 participants, muscle pain or weakness was reported by 27.1% of people taking a statin and 26.6% taking placebo. In the first year, statins caused about 11 extra reports of muscle pain or weakness per 1,000 people per year, and after the first year there was no significant excess.3
A smaller trial looked at people who had already quit statins because of side effects. They were given months of statin tablets, placebo tablets and no tablets in random order, and scored their symptoms daily. Average symptom scores were 16.3 in statin months, 15.4 in placebo months and 8.0 in months with no tablets.4
The symptoms were real, but taking a tablet of any kind produced most of them. Aches still deserve attention. The cause just needs checking before the statin is blamed. See statin side effects for the full picture.
Blood sugar and liver tests
Statins cause a small rise in blood sugar. Pooled trial data show that low-intensity or moderate-intensity statin therapy increased new diagnoses of diabetes by 10% in relative terms, from 1.2% to 1.3% of participants per year, and high-intensity therapy increased them by 36%.5
Most of those new diagnoses were in people whose blood sugar was already close to the diabetes threshold. The authors note that the cardiovascular benefit seen in the trials already takes this effect into account.
Liver blood tests can also shift. In the blinded statin trials, abnormal liver enzyme results occurred in 0.30% of people per year on a statin and 0.22% per year on placebo.6 The 2018 guideline lists liver failure from statins as rare.
When to contact your prescriber
- New muscle pain, tenderness or weakness that you cannot explain, especially if it is severe. Serious muscle injury from statins is rare, but it needs prompt attention.
- A new prescription, antibiotic or supplement from someone else, so interactions can be checked.
- A wish to stop. Say so before you do.
Do not start, stop or change a medication without your prescriber. Stopping on your own removes the protection the statin provides and leaves the question of what caused your symptom unanswered.
Questions to ask at the start
- What LDL cholesterol or ApoB level are we aiming for, and why?
- When is my follow-up blood test?
- What should I do if I get muscle aches?
- Will you check my blood sugar, and how often?
- What is the plan if this dose does not get me to goal?
Next step: a fuller picture of your risk on treatment
A statin lowers risk without removing it. Both Cardio Res-Q assessments, the Comprehensive Assessment ($775) and the Enhanced Assessment ($999), include ApoB, Lp(a), hs-CRP and blood sugar markers, which can show whether risk remains once you are treated. The clinic can share results with your prescriber.
Read Already on a Statin? for what an assessment adds and where the calcium scan becomes harder to interpret, then see the Cardio Res-Q program page.
Are You a Candidate for Cardio Res-Q?
Three quick questions about the risk factors we screen for. Your answers stay between you and the clinic.
Frequently asked questions
How soon does a statin start working?
The effect on LDL cholesterol can be measured within weeks, which is why guidance has called for a repeat blood test 4 to 12 weeks after starting. The trials that showed fewer heart attacks and strokes followed people for several years of continued treatment.
Will I be on a statin for life?
Statins work for as long as you take them, and the risk they treat usually persists. Whether and when treatment could change is a question for your prescriber, based on your risk, your results and how you tolerate it.
What if my LDL does not drop much?
Tell your prescriber honestly how often you have taken it, since missed doses are one possible reason. If you have been consistent, people do respond differently, and your prescriber can discuss a different dose, a different statin or an added medication.
Should I take a supplement to prevent statin side effects?
No supplement has been shown to reliably do that. The evidence on the most popular choice is reviewed in our article on CoQ10 and statins. Tell your prescriber about anything you take.
Related reading
This article is for general education and is not medical advice. Decisions about testing and medication should be made with your clinician. If you have chest pain or other symptoms of a heart attack, call 911.
