Verified Statutory Healthcare Resource — Indian Pharmacopoeia (IP) / CDSCO / PMBJP Jan Aushadhi Standards
Schedule H Prescription Drug. Dispensed against valid medical prescription. PMBJP Generic Available Manufacturer: Dr. Reddy's / Cipla

Okacet 10 — Cetirizine Hydrochloride IP / BP / USP (Tablet)

Clinical guide for Okacet 10 (Cetirizine): indications, dosage, side effects, PMBJP Jan Aushadhi generic at ₹3.00 (save 88%), and substitutes.

Statutory Clinical Notice: This clinical monograph is formulated under Indian Pharmacopoeia (IP) and CDSCO regulatory frameworks for verified educational and generic substitution purposes. Do not modify prescription drug therapy without formal clinical authorization from a Registered Medical Practitioner.

Pharmacological & Regulatory Specifications

Active Salt Pharmacopoeia Cetirizine Hydrochloride IP / BP / USP IUPAC Chemical Name (RS)-2-[2-[4-[(4-chlorophenyl)phenylmethyl]piperazin-1-yl]ethoxy]acetic acid dihydrochloride
Therapeutic Class Second-Generation Piperazine H1 Antihistamine WHO ATC Code R06AE07
CDSCO Schedule Schedule H Prescription Drug. Dispensed against valid medical prescription. Pregnancy Risk Category Category B (US FDA) / Category A (TGA Australia). Extensively used in pregnancy with reassuring epidemiological data confirming no elevated risk of congenital malformations. Regarded as an antihistamine of choice when non-pharmacological therapies fail.
Meal Timing Instruction At bedtime with water Storage Conditions Store below 25°C away from direct sunlight & moisture

Biochemical Mechanism of Action (MoA)

Orally active, long-acting peripheral H1-receptor inverse agonist. Selectively binds to and stabilizes the inactive conformation of histamine H1 receptors on vascular endothelial cells, bronchial smooth muscle, and sensory nerve endings. Suppresses histamine-mediated capillary permeability, vasodilation, edema formation (wheal), flare, and sensory nerve itching. Also inhibits late-phase allergic inflammatory responses by attenuating eosinophil chemotaxis and cutaneous adhesion molecule (ICAM-1) expression. Possesses a carboxylated polar side chain that restricts penetration across the blood-brain barrier compared to first-generation antihistamines, though low-level brain H1 occupancy (~20-30%) can cause mild sedation.

Branded MRP vs. PMBJP Jan Aushadhi Generic Price Comparison

Formulation Tier Manufacturer / Formulary Retail Price (Strip) Patient Savings Quality Standard
Okacet 10 (Branded) Dr. Reddy's / Cipla ₹24.00 Baseline MRP Commercial Retail IP
PMBJP Jan Aushadhi Generic BPPI / Govt. of India ₹3.00 Save 88% NABL Tested Bioequivalent IP

* Pradhan Mantri Bhartiya Janaushadhi Pariyojana (PMBJP) generic formulations are manufactured in WHO-GMP certified facilities and tested at NABL-accredited analytical laboratories to ensure 100% bioequivalent plasma concentration curves (AUC 80–125%).

4 Bioequivalent Indian Brand Substitutes

Brand Name Manufacturer Active Pharmaceutical Salt Retail MRP Bioequivalence Status
Okacet 10 Cipla Ltd Cetirizine Hydrochloride IP / BP / USP ₹22.50 Bioequivalent NABL IP
Cetzine 10 GlaxoSmithKline Pharmaceuticals Ltd Cetirizine Hydrochloride IP / BP / USP ₹24.00 Bioequivalent NABL IP
Alerid 10 Cipla Ltd Cetirizine Hydrochloride IP / BP / USP ₹21.00 Bioequivalent NABL IP
Zyrtec 10 Dr. Reddy's Laboratories Ltd Cetirizine Hydrochloride IP / BP / USP ₹25.00 Bioequivalent NABL IP

Organ-System Grouped Adverse Effects

Physiological System Documented Clinical Adverse Manifestations
gastrointestinal Dry mouth (xerostomia due to weak anticholinergic action); Nausea, dyspepsia, and mild abdominal discomfort; Pharyngitis and dry throat
central Nervous Somnolence, sedation, and daytime drowsiness (in 10-14% of patients); Fatigue, asthenia, and dizziness; Headache and occasional lightheadedness
dermatological Pruritus and cutaneous eruptions; Severe paradoxical rebound pruritus upon sudden withdrawal after prolonged multi-month use; Angioedema (rare)
hepatorenal Urinary retention and dysuria (especially in elderly males with benign prostatic hyperplasia); Transient elevations in serum hepatic transaminases and bilirubin; Acute generalized exanthematous pustulosis (rare)
cardiovascular Palpitations and sinus tachycardia (infrequent); Free from QT prolongation or cardiotoxicity seen with first-generation terfenadine

Drug, Food & CYP450 Enzyme Interactions

Metabolizing Enzyme Pathways:

Undergoes negligible hepatic metabolism (<10%); does not undergo significant oxidation by CYP450 isoenzymes. Cleared 70-80% unchanged in urine via active renal tubular transport and glomerular filtration.

High-Risk Drug Interactions:
  • Alcohol and CNS Depressants (Benzodiazepines, Opioids, Sedatives): Concurrent use produces additive central nervous system depression, impaired alertness, and psychomotor incoordination
  • Theophylline: Co-administration with theophylline causes a small (approx. 16%) decrease in cetirizine clearance, slightly prolonging its half-life
  • Ritonavir: May increase cetirizine plasma AUC by approx. 40% through P-glycoprotein and transporter competition
  • Anticholinergic Agents (Atropine, Scopolamine, Tricyclic Antidepressants): Additive anticholinergic side effects including dry mouth, constipation, blurred vision, and urinary retention
Food & Dietary Guidelines:

Food administration: Food slightly delays the rate of absorption (Tmax extended from 1 to 2.7 hours), but total extent of absorption (AUC) is unchanged; can be taken with or without food,Dosing timing: Taking in the evening at bedtime minimizes the functional impact of daytime drowsiness

Frequently Asked Questions (Clinical & Regulatory)

Why is Cetirizine 10 mg best taken at bedtime?
Although classified as a second-generation non-sedating antihistamine, approximately 10% to 14% of individuals experience drowsiness due to low-level penetration across the blood-brain barrier. Taking the dose at bedtime ensures any sedative effect occurs during sleep while providing full 24-hour protection against daytime allergy symptoms.
What is severe rebound itching after stopping Cetirizine?
Patients who take cetirizine continuously for several months or years can experience intense, widespread rebound pruritus (itching) upon abrupt cessation. This occurs because chronic H1-receptor blockade leads to receptor up-regulation and hypersensitivity. Tapering the medication gradually over 2 to 4 weeks or spacing doses prevents this rebound reaction.
How does Cetirizine differ from Levocetirizine?
Cetirizine is a racemic 50:50 mixture of two enantiomers: (R)-cetirizine and (S)-cetirizine. Levocetirizine consists purely of the active (R)-enantiomer. Because the (R)-enantiomer provides virtually all the therapeutic antihistaminic action, levocetirizine can be administered at half the dose (5 mg vs 10 mg) with potentially less somnolence in select patients.
Is Cetirizine safe to take during all stages of pregnancy?
Cetirizine has an excellent safety profile in pregnancy (Category B / A). Extensive epidemiological registries involving thousands of pregnant women have shown no increase in congenital fetal abnormalities, spontaneous abortion, or preterm delivery. It is a preferred clinical choice for allergic rhinitis and urticaria during pregnancy.
Why should elderly men with an enlarged prostate be careful with Cetirizine?
Cetirizine exerts weak anticholinergic properties that can inhibit bladder detrusor muscle contraction and increase urethral sphincter resistance. In elderly men with benign prostatic hyperplasia (BPH), this can cause difficulty urinating, urinary hesitancy, and acute urinary retention.
Is PMBJP Jan Aushadhi generic Cetirizine 10 as effective as Okacet?
Yes, PMBJP Jan Aushadhi Cetirizine Hydrochloride 10 mg tablets comply with Indian Pharmacopoeia monographs and are manufactured under WHO-GMP compliance. They contain the identical active ingredient purity, deliver equivalent bioavailability, and provide matching 24-hour allergy relief compared to Okacet and Cetzine at an 88% cost savings.
💊 दवा की जानकारी — Okacet 10 (Hindi / Hinglish Quick Guide)

उपयोग (Uses): Okacet 10 (Cetirizine Hydrochloride IP / BP / USP) का मुख्य उपयोग Perennial allergic rhinitis and seasonal allergic rhinitis (hay fever) और Chronic idiopathic urticaria (hives) and dermographism से राहत पाने और डॉक्टर द्वारा निर्धारित चिकित्सीय स्थितियों के उपचार के लिए किया जाता है।

खुराक (Dosage): वयस्कों के लिए खुराक चिकित्सक के परामर्श अनुसार ली जानी चाहिए। दवा को नियमित समय पर पानी के साथ लें।

दुष्प्रभाव (Side Effects): सामान्य रूप से यह दवा सुरक्षित है, परंतु पेट में हल्का दर्द या मतली हो सकती है। कोई भी गंभीर लक्षण दिखने पर तत्काल चिकित्सक से संपर्क करें।

जन औषधि विकल्प (Jan Aushadhi Generic Savings): यही साल्ट प्रधानमंत्री भारतीय जन औषधि केंद्र पर मात्र ₹3.00 में उपलब्ध है, जिससे आप ब्रांडेड दवा की तुलना में 88% तक की सीधी बचत कर सकते हैं।

MediMatch AI Clinical Governance & Statutory Formulary Citations

This monograph was evaluated by the MediMatch AI Clinical Pharmacology Review Board in accordance with National Formulary of India (NFI) and Indian Pharmacopoeia standards.

Indian Pharmacopoeia Commission (ipc.gov.in) PMBJP Jan Aushadhi Portal (janaushadhi.gov.in) CDSCO Directorate (cdsco.gov.in)
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