Indications Xelpid is indicated as an adjunct to diet to reduce elevated total cholesterol, LDL cholesterol, apolipoprotein B (Apo-B), and triglyceride levels when diet and other non‑pharmacological measures are inadequate.

Familial hypercholesterolemia (heterozygous and homozygous)
Mixed dyslipidemia (Fredrickson Type IIa and IIb)
Hypertriglyceridemia (Fredrickson Type IV)
Dysbetalipoproteinemia (Fredrickson Type III)
Coronary artery disease with elevated LDL cholesterol
Hypercholesterolemia associated with diabetes mellitus or renal transplantation

Pharmacology Atorvastatin selectively inhibits HMG-CoA reductase, the rate‑limiting enzyme in cholesterol biosynthesis. It lowers plasma cholesterol and lipoproteins by reducing hepatic cholesterol synthesis and increasing LDL receptor activity.

Absorption: Rapid, peak plasma levels in 1–2 hours; bioavailability ~14%.
Distribution: Volume of distribution ~381 L; 98% protein bound.
Metabolism: Extensively metabolized via CYP3A4 to active metabolites.
Excretion: Primarily biliary; half‑life ~14 hours, inhibitory activity 20–30 hours.

Dosage & Administration

Adults: 10–80 mg once daily, adjusted at ≥4‑week intervals.
Children (10–18 years): 10–20 mg once daily (max 20 mg studied).
Familial hypercholesterolemia: Adults up to 80 mg daily; children up to 80 mg daily.
Prevention of cardiovascular events: Start at 10–20 mg daily; adjust per response.

Interaction Risk of myopathy increases with cyclosporine, fibrates, niacin, erythromycin, azole antifungals.

Antacids ↓ atorvastatin plasma levels ~35% (no effect on LDL reduction).
Colestipol ↓ atorvastatin ~25% but enhances LDL reduction.
Digoxin ↑ plasma levels ~20%.
Oral contraceptives ↑ norethindrone and ethinyl estradiol levels.
Erythromycin ↑ atorvastatin ~40%.
Warfarin: No significant effect.

Contraindications

Hypersensitivity to components
Active liver disease or persistent transaminase elevation
Pregnancy and lactation

Side Effects Generally well tolerated. Common: constipation, flatulence, dyspepsia, abdominal pain. Others: headache, rash, myalgia, arthralgia, back pain, asthenia.

Pregnancy & Lactation Contraindicated. May cause fetal harm; discontinue during pregnancy. Not recommended during breastfeeding.

Precautions & Warnings Monitor liver function before and during therapy. Discontinue if myopathy or markedly elevated CPK occurs. Use cautiously in patients with alcohol use or liver disease.

Special Populations

Elderly: Higher plasma concentrations; greater LDL reduction.
Renal impairment: No dose adjustment needed.
Hemodialysis: Not effective in clearance.
Hepatic impairment: Markedly increased plasma concentrations.