Zimva

Zimva is an oral cholesterol-lowering medication containing Simvastatin as its active ingredient. It belongs to the Statin (HMG-CoA Reductase Inhibitor) drug class, manufactured by Siam Bheasach, a Thai pharmaceutical company.

Simvastatin works by inhibiting HMG-CoA reductase, a key enzyme in the liver's cholesterol synthesis pathway. When inhibited, the liver produces less cholesterol and increases LDL reuptake from the bloodstream, resulting in a significant reduction in LDL (bad cholesterol) levels.

Simvastatin is one of the most widely used statins worldwide, with a long history of clinical use and extensive safety data. It should be taken at bedtime because the body produces the most cholesterol at night.

1. High Cholesterol (Hypercholesterolaemia):

Zimva reduces LDL (bad cholesterol) and triglyceride levels while increasing HDL (good cholesterol). Suitable for those whose lifestyle changes alone have not achieved adequate control.

2. Cardiovascular Disease Prevention:

Reduces the risk of heart attack, stroke, and atherosclerosis in high-risk individuals, such as those with diabetes or a family history of heart disease.

3. Mixed Dyslipidaemia:

Used in patients with elevated LDL, high triglycerides, and low HDL.

4. Familial Hypercholesterolaemia:

Used in patients with genetically high cholesterol levels, both heterozygous and homozygous forms.

Starting dose: Take 10–20 mg once daily at bedtime.

Maximum dose: 40 mg per day (80 mg is not recommended due to significantly increased risk of rhabdomyolysis).

Why take at bedtime? The body produces the most cholesterol at night, and Simvastatin has a short half-life (2–3 hours). Taking it at bedtime ensures peak drug activity coincides with peak cholesterol production.

Important notes:

• Can be taken with or without food
• Do not take with grapefruit or grapefruit juice — significantly increases drug blood levels
• Must be taken consistently every day, even without symptoms
• Dietary control and exercise are still essential — medication does not replace lifestyle changes

Dose adjustment: Your doctor will check lipid levels 4–6 weeks after starting and adjust the dose as needed.

Common side effects:

• Muscle pain (myalgia) — most common; unexplained muscle aches
• Headache
• Diarrhoea, constipation, nausea
• Abdominal pain, bloating

Serious side effects (stop and seek emergency medical help):

• Rhabdomyolysis — severe muscle breakdown. Symptoms: severe muscle pain, weakness, dark brown urine (cola-coloured). Seek emergency care immediately as it can cause kidney failure
• Hepatitis — elevated liver enzymes. Symptoms: jaundice (yellow skin/eyes), dark urine, extreme fatigue
• Increased blood sugar levels — may slightly increase type 2 diabetes risk

Important: If you experience unexplained muscle pain, weakness, or dark-coloured urine, stop the medication and see your doctor immediately.

Absolute contraindications:

• Pregnancy or breastfeeding — Statins are Category X; strictly prohibited during pregnancy
• Active liver disease or unexplained persistent elevated liver enzymes
• Allergy to Simvastatin or any ingredient
• Strong CYP3A4 Inhibitors — such as Clarithromycin, Itraconazole, Ketoconazole, Ritonavir, Nelfinavir; drastically increase Simvastatin levels and rhabdomyolysis risk
• Gemfibrozil — must not be used together

Use with caution:

• Limit to 10 mg when used with Amlodipine, Diltiazem, or Verapamil
• Do not take with grapefruit or grapefruit juice — grapefruit inhibits CYP3A4, raising drug levels
• Elderly patients — higher risk of muscle pain
• Kidney disease — dose adjustment may be needed
• Heavy alcohol use — increases risk of liver damage

Zimva (Simvastatin) vs. Atorvastatin: Atorvastatin has a longer half-life (14 hours vs 2–3 hours), so it does not need to be taken at bedtime. It provides stronger LDL reduction at equivalent doses (e.g., Atorvastatin 10 mg ≈ Simvastatin 20 mg) with slightly fewer drug interactions. Suitable for those needing greater LDL reduction or taking other medications.

Zimva (Simvastatin) vs. Rosuvastatin: Rosuvastatin is the most potent statin, with the greatest LDL reduction (up to 55–63%). It is not metabolised through CYP3A4, resulting in significantly fewer drug interactions than Simvastatin. Can be taken at any time of day. However, it costs more.

Advantages of Zimva: Very affordable price, long clinical history, extensive safety data. Ideal for those needing moderate LDL reduction who are not taking CYP3A4-interacting drugs.

Simvastatin is metabolised by the CYP3A4 enzyme in the liver. Drugs that inhibit CYP3A4 significantly increase Simvastatin blood levels, raising the risk of rhabdomyolysis.

Strictly contraindicated combinations:

• Clarithromycin, Erythromycin — macrolide antibiotics
• Itraconazole, Ketoconazole — antifungal medications
• Ritonavir, Nelfinavir — HIV antivirals
• Gemfibrozil — fibrate lipid-lowering drug
• Cyclosporine, Danazol

Limit Simvastatin to 10 mg when used with:

• Amlodipine — blood pressure medication
• Diltiazem, Verapamil — calcium channel blockers
• Amiodarone — antiarrhythmic medication

Grapefruit: Do not eat grapefruit or drink grapefruit juice while taking this medication, as it also inhibits CYP3A4.

Zimva is a pharmacist-dispensed medication. You can order online from Intimo Life.

Can I buy Zimva online?

Yes. Order through Intimo Life — select the product, consult with a licensed pharmacist online, and receive your medication at home.

Do I need a prescription?

A doctor's prescription is not required, but the medication must be dispensed by a licensed pharmacist. At Intimo Life, our pharmacist will review your symptoms and health history to confirm suitability before shipping.

How does Intimo Life ship orders?

We deliver nationwide in Thailand with discreet packaging — no product names on the outside.