Pravastatin Tablets

Pravastatin is a statin with a distinctive pharmacological profile that sets it apart from most other medicines in its class, it is not significantly metabolised by cytochrome P450 enzymes, giving it a notably cleaner drug interaction profile than statins such as atorvastatin and simvastatin. Pravastatin tablets are a prescription-only statin used in adults and children aged eight and over for cholesterol lowering and cardiovascular risk reduction. A prescription can only be issued following a clinical consultation.

Pravastatin tablets are an oral prescription medicine containing Pravastatin sodium as the active ingredient. Pravastatin belongs to the statin class of lipid-lowering medicines, also known as HMG-CoA reductase inhibitors. Unlike most other statins, Pravastatin is hydrophilic (water-soluble) rather than lipophilic (fat-soluble), and it is not significantly metabolised by the CYP3A4 or CYP2C9 enzyme pathways. This pharmacokinetic profile gives Pravastatin a lower potential for drug interactions involving CYP enzymes than most other statins.

Pravastatin is licensed in the UK for adults and children aged eight and over for the following indications: primary hypercholesterolaemia and mixed dyslipidaemia; secondary prevention of cardiovascular events in patients with established cardiovascular disease; treatment of familial hypercholesterolaemia. The secondary prevention indication is supported by substantial trial evidence including the CARE and LIPID trials. Pravastatin is also licensed for use in children from the age of eight with heterozygous familial hypercholesterolaemia.

Pravastatin is available in three strengths: 10 mg, 20 mg, and 40 mg tablets. It is classified as a low to medium intensity statin. NICE guideline NG238 recommends high intensity statins for most adults requiring lipid lowering for cardiovascular risk reduction. However, Pravastatin may be appropriate in specific patient groups, including those on complex medication regimens where its clean interaction profile is advantageous.

Pravastatin lowers cholesterol through HMG-CoA reductase inhibition, the same mechanism as all statins, but with a pharmacokinetic profile that distinguishes it within the class.

HMG-CoA Reductase Inhibition. Pravastatin competitively inhibits HMG-CoA reductase, the enzyme that catalyses the rate-limiting step in hepatic cholesterol synthesis. Reducing intracellular cholesterol production causes liver cells to upregulate LDL receptors on their surface, capturing more LDL cholesterol from the bloodstream and reducing circulating LDL levels. Pravastatin also modestly lowers triglycerides and raises HDL cholesterol.

Why Pravastatin Has a Distinctive Interaction Profile. Most statins, including atorvastatin, simvastatin, and lovastatin, are metabolised predominantly by the CYP3A4 enzyme. Fluvastatin is metabolised by CYP2C9. Pravastatin is different: it is not significantly metabolised by either CYP3A4 or CYP2C9. Instead, it is eliminated largely unchanged through the kidneys and gut, with some sulfation occurring. This means Pravastatin is not affected by CYP3A4 inhibitors such as grapefruit, itraconazole, or erythromycin, and is not significantly affected by CYP2C9 inhibitors such as fluconazole.

This clean interaction profile makes Pravastatin a clinically useful option in patients taking medicines that interact with CYP3A4 or CYP2C9, such as certain immunosuppressants, antiretrovirals, or antifungals. It is also used in patients with organ transplants taking ciclosporin, although the ciclosporin interaction with Pravastatin is still present through non-CYP mechanisms and requires dose limitation.

Always take Pravastatin exactly as your prescriber instructs. Read the Patient Information Leaflet supplied with your medicine before starting treatment.

• Take Pravastatin once daily, at any time of day.
• Pravastatin can be taken with or without food.
• Swallow the tablet whole with a glass of water.
• Grapefruit juice does not significantly affect pravastatin, unlike simvastatin and atorvastatin.

If you miss a dose, take it as soon as you remember. If you only remember the following day, skip the missed dose and continue as normal. Do not take two doses on the same day. Do not stop taking Pravastatin without speaking to your prescriber first.

Your prescriber will arrange lipid level monitoring before starting and typically four to twelve weeks after beginning treatment. Liver function may be checked.

Pravastatin 10 mg Tablets: Used as a starting dose in patients who are more sensitive to statin effects, in older patients, in those with kidney impairment, or in children aged eight and over being initiated on statin therapy for familial hypercholesterolaemia.

Pravastatin 20 mg Tablets: A standard starting dose for most adults with primary hypercholesterolaemia. After four to twelve weeks, the prescriber will review the lipid response and decide whether to continue at 20 mg or increase to 40 mg.

Pravastatin 40 mg Tablets: The maximum available dose in this range and the most commonly used maintenance dose, also recommended by NICE for Pravastatin when used in secondary prevention, though NICE guideline NG238 generally recommends high intensity statins for most adults. All dose decisions are made by your prescriber. Do not change your dose without medical advice.

Like all statins, Pravastatin can cause side effects.

Common Side Effects (may affect up to 1 in 10 people):

• Muscle aches, pains, or weakness (myalgia). Contact your prescriber promptly if you experience unexplained muscle pain, particularly if severe or accompanied by dark urine.
• Gastrointestinal effects including nausea, abdominal pain, diarrhoea, or constipation.
• Headache.
• Fatigue.

Uncommon Side Effects (may affect up to 1 in 100 people):

• Raised liver enzymes on blood tests, usually asymptomatic.
• Sleep disturbances.
• Dizziness.
• Skin rash.
• A small increase in the risk of type 2 diabetes, outweighed by cardiovascular benefit in eligible patients.

Serious Side Effects — Seek Urgent Medical Attention: Go to your nearest accident and emergency department or call 999 immediately if you experience severe muscle pain, weakness, or cramps, particularly with dark, tea coloured urine (rhabdomyolysis); signs of significant liver problems such as yellowing of the skin or eyes, severe abdominal pain, or very dark urine; or signs of a severe allergic reaction such as sudden swelling of the face, lips, tongue, or throat.

Pravastatin tablets may be suitable if you:

• Are an adult with primary hypercholesterolaemia or mixed dyslipidaemia where LDL reduction is required.
• Have established cardiovascular disease and require secondary prevention.
• Have familial hypercholesterolaemia, including as a child aged eight and over.
• Are taking medicines that interact with CYP3A4 or CYP2C9, making Pravastatin a clinically preferable statin due to its lower interaction potential.
• Are already prescribed Pravastatin and require a repeat prescription through an online prescribing service.

Pravastatin tablets are not suitable if you:

• Are pregnant or planning to become pregnant. Pravastatin is contraindicated in pregnancy. Effective contraception is required during treatment and for an appropriate period after stopping.
• Are breastfeeding.
• Have active liver disease or persistently elevated liver enzymes of unknown cause.
• Have a known allergy or hypersensitivity to Pravastatin or any excipient listed in the SmPC.

Important Drug Interactions: Ciclosporin significantly increases Pravastatin blood levels through non-CYP mechanisms — the SmPC advises limiting Pravastatin to a maximum of 20 mg per day when used with ciclosporin. Fibrates such as gemfibrozil and fenofibrate increase myopathy risk when combined with any statin. Colchicine may increase myopathy risk. Warfarin's anticoagulant response may be modestly affected — INR monitoring advisable. Bile acid sequestrants such as colestyramine reduce Pravastatin absorption — take at least one hour before or four hours after. Grapefruit juice does not significantly interact with pravastatin, unlike most other statins.

Pravastatin is a Prescription Only Medicine. The clinical consultation is the essential first step. A prescription will only be issued if a registered prescriber concludes, based on their individual assessment of your circumstances, that Pravastatin is clinically appropriate for you.

During your online consultation with Pharmacy Planet, a registered prescriber will review your cholesterol and lipid levels, cardiovascular risk assessment, current medicines, relevant medical history, and the indication for statin therapy. The prescriber will determine whether Pravastatin is appropriate for your individual situation, including whether its specific interaction profile makes it preferable to other statins in your case, and whether online prescribing is suitable.

Not all consultations will result in a prescription. The prescriber may recommend a higher-intensity statin, a different lipid-lowering approach, or request blood test results before prescribing proceeds.