Depin Retard

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What Is Depin Retard?

Depin Retard is an oral 20 mg nifedipine retard from Zydus Cadila, supplied in 30-90 tablets. Introduced 1981 (Bayer as Adalat / Procardia) — the original dihydropyridine CCB. Short-acting immediate-release nifedipine caused controversy in the 1990s after reports of MI and mortality increase with sublingual / rapid-onset formulations; modern practice uses extended-release (Retard, MR, CC, XL, OROS) formulations exclusively for chronic hypertension.

Nifedipine belongs to the dihydropyridine calcium-channel blocker subclass, distinguished from the non-dihydropyridines (diltiazem, verapamil) by its selective action on vascular smooth muscle with minimal direct cardiac effect. This selectivity profile is clinically important: DHPs can be combined safely with beta-blockers (the combination is standard in angina), while non-DHPs cannot (additive bradycardia/heart-block risk).

How Nifedipine Works

Calcium-channel blockers bind L-type voltage-gated calcium channels and reduce calcium influx into the cell during depolarisation. In arterial smooth muscle, reduced calcium entry means less actin-myosin interaction and direct arterial vasodilation — lowering systemic vascular resistance and blood pressure.

Dihydropyridines are ~10-fold more potent on vascular smooth muscle than on cardiac muscle — so the dominant clinical effect is vasodilation, with minimal direct suppression of cardiac contractility or conduction. The body’s baroreflex can trigger mild reflex tachycardia after fast-onset vasodilation; this is the problem with short-acting nifedipine that led to the 1990s controversy — modern ER formulations eliminate it via slow smooth onset.

Onset of clinical effect: Retard onset 1-4 hours; full BP effect at 1-2 weeks.

Approved and Evidence-Based Uses

• Hypertension — Retard / CC / XL formulation only
• Hypertension in pregnancy — Retard/MR is first- or second-line alongside labetalol and methyldopa
• Preterm labour tocolysis (off-label but widely used) — relaxes uterine smooth muscle
• Prinzmetal / vasospastic angina
• Raynaud’s phenomenon
• Chronic stable angina — often combined with a beta-blocker (the beta-blocker blunts the reflex tachycardia)

Pivotal trial evidence: INSIGHT (2000) — nifedipine GITS non-inferior to co-amilozide for CV events in HTN. ACTION (2004) — nifedipine GITS added to standard angina therapy reduced need for coronary procedures.

Depin Retard Dosage

Hypertension:

• Starting dose: Retard 20 mg twice daily OR CC/XL 30 mg once daily
• Target dose: Retard 20-30 mg twice daily OR CC/XL 30-60 mg once daily
• Maximum: Retard 60 mg twice daily OR CC/XL 90 mg once daily
• Titrate every 1-2 weeks based on BP response and tolerability (particularly oedema)

Angina: Retard 20-40 mg twice daily

Administration: once daily (or twice daily for IR nifedipine formulations). Swallow whole — do NOT crush or split extended-release formulations (delivers an IR dose with risk of hypotension). Take with or without food.

Discontinuation: no specific withdrawal syndrome; can be stopped without taper. BP will return to pre-treatment levels within 1-2 weeks.

Side Effects

Common (>5%, mostly mild and transient):

• Peripheral (ankle) oedema — Peripheral (ankle) oedema — similar mechanism to amlodipine; more common with nifedipine at higher doses. Gum hyperplasia is a recognised long-term complication (10-15% after 2+ years); practice meticulous oral hygiene and schedule dental reviews.
• Flushing (warm face and upper body)
• Headache (particularly at start of therapy; usually adapts within 2-4 weeks)
• Reflex tachycardia (palpitations) — less common with long-acting formulations
• Dizziness, postural hypotension
• Fatigue
• Mild constipation (less than non-DHPs)

Uncommon:

• Gingival hyperplasia (gum overgrowth) — 10-15% of long-term users; practice meticulous oral hygiene and schedule dental reviews every 6 months
• Rash, pruritus
• Nausea, abdominal discomfort
• Erectile dysfunction (rare)
• Liver enzyme elevations (usually mild, reversible)
• Rare reports of photosensitivity

Historical warning: short-acting (immediate-release) nifedipine capsules, particularly when used sublingually for “hypertensive urgency”, were associated with myocardial infarction and mortality increase in the 1990s (Psaty 1995). Modern practice uses ER (Retard/MR/CC/XL/OROS) formulations exclusively for chronic HTN. Never crush or open an ER capsule to make an IR dose.

Contraindications & Cautions

• Known hypersensitivity to nifedipine or dihydropyridine class
• Cardiogenic shock
• Severe aortic stenosis (can cause critical hypotension)
• Unstable angina or MI within 1 month (DHPs other than amlodipine)
• Obstructive hypertrophic cardiomyopathy (reduces outflow gradient dynamically)
• Severe hepatic impairment (all DHPs are hepatically metabolised)

Pregnancy: nifedipine MR is pregnancy-safe and is first- or second-line for gestational hypertension and preeclampsia alongside labetalol and methyldopa. Also used off-label for preterm-labour tocolysis.

Breastfeeding: small amounts in breast milk; generally considered acceptable with infant monitoring.

Drug Interactions

• Grapefruit juice — inhibits CYP3A4 metabolism; can raise plasma levels of amlodipine and particularly nifedipine/nimodipine by 2-3×. Avoid on treatment days, or use consistently if at all.
• Strong CYP3A4 inhibitors (ketoconazole, itraconazole, clarithromycin, ritonavir, cobicistat) — raise CCB plasma levels; reduce dose or avoid
• Strong CYP3A4 inducers (rifampicin, phenytoin, carbamazepine, St John’s wort) — reduce CCB plasma levels; may need dose increase
• Simvastatin — amlodipine modestly increases simvastatin exposure; cap simvastatin at 20 mg/day when combined
• Beta-blockers — DHPs combine safely with beta-blockers (the combination is standard in angina — beta-blocker blunts reflex tachycardia, CCB provides vasodilation). Distinct from non-DHP CCBs (diltiazem, verapamil) which should NOT be combined with beta-blockers.
• Other antihypertensives — generally complementary; monitor BP
• Sildenafil / tadalafil (PDE5 inhibitors for erectile dysfunction) — additive hypotension; caution particularly at high CCB doses

Calcium-Channel Blocker Class at a Glance

DHP vs non-DHP — why it matters: DHPs (amlodipine, nifedipine) act selectively on arterial smooth muscle with minimal cardiac effect — safe to combine with beta-blockers. Non-DHPs (diltiazem, verapamil) slow AV nodal conduction and reduce cardiac contractility — do NOT combine with beta-blockers (additive bradycardia, heart block, acute heart failure risk). If your patient is already on a beta-blocker, use a DHP.

Storage

Store Depin Retard below 25°C. Protect from light. Keep out of reach of children.

Frequently Asked Questions

Why have my ankles started swelling after Depin Retard?

Peripheral oedema is a class effect of dihydropyridines, caused by pre-capillary arteriolar dilation that raises hydrostatic pressure in the lower-leg venules. It is NOT fluid overload and does NOT respond to diuretics. Management options: (1) reduce the CCB dose; (2) add an ACE inhibitor or ARB which balances pre- and post-capillary vasodilation and eliminates the oedema mechanism (often the preferred solution); (3) switch to a non-DHP CCB (diltiazem, verapamil) if rate-related side effects are acceptable; (4) leg elevation and compression stockings as adjuncts.

How long does Depin Retard take to lower blood pressure?

ER/Retard nifedipine: noticeable BP drop within 1-4 hours; full effect at 1-2 weeks.

Can I take Depin Retard with a beta-blocker?

Yes — DHPs combine safely with beta-blockers. The combination is standard in angina: the DHP vasodilates and reduces myocardial oxygen demand; the beta-blocker blunts the reflex tachycardia. This is different from non-DHP CCBs (diltiazem, verapamil) which should NOT be combined with beta-blockers due to additive bradycardia and heart-block risk.

Can I eat grapefruit on Depin Retard?

Grapefruit (juice and fresh fruit) inhibits CYP3A4 metabolism and can raise nifedipine plasma levels by 2-3×, increasing the risk of hypotension, dizziness, and oedema. Best practice: avoid grapefruit/juice while on CCBs, or consume consistently (your dose is titrated to BP response; sporadic grapefruit disrupts that).

Is Depin Retard safe in pregnancy?

Nifedipine MR is pregnancy-safe and is first- or second-line antihypertensive in pregnancy alongside labetalol and methyldopa. Also used off-label to delay preterm labour (tocolysis).

Can I combine Depin Retard with my other BP medications?

Yes — DHP CCBs combine well with ACE inhibitors (ramipril, lisinopril), ARBs (losartan, telmisartan, olmesartan), beta-blockers (bisoprolol, metoprolol), and thiazide diuretics (HCTZ). The ACEi/ARB + CCB combination is particularly useful because it eliminates the ankle oedema side effect.

Why should I not use immediate-release nifedipine for chronic HTN?

Short-acting (immediate-release) nifedipine causes rapid BP drops with reflex sympathetic activation — tachycardia and a surge in sympathetic tone that, in some observational studies from the 1990s, was associated with myocardial infarction and mortality increase. The extended-release formulations (Retard, MR, CC, XL, OROS) deliver the same total daily dose over 24 hours with a smooth plasma profile and do not have this problem. Always use extended-release nifedipine for chronic hypertension, never IR capsules.

Where can I buy Depin Retard online?

You can buy Depin Retard (nifedipine 20 mg, 30-90 tablets) from MedsBase with discreet packaging and worldwide shipping.

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