Oral liquids · Contract manufacturing in India

Diphenhydramine 480 mg / 100 ml · Syrup

Discuss third-party manufacturing of Diphenhydramine 480 mg / 100 ml Syrup with Walter Healthcare, India. Share your target market, required bottle count and fill volume, packaging and launch timeline for a product-specific quotation.

Catalogue reference: WH-5351
Composition and strength: Diphenhydramine 480 mg / 100 ml
Dosage form: Syrup
Indicative administration route: Oral
Therapeutic navigation area: Respiratory & allergy
Pharmacological class: H1 antihistamine
Manufacturing stream: Non-beta-lactam

Catalogue details support an initial B2B discussion. Walter confirms the applicable unit, current licence scope, formula, target market and commercial feasibility before making a commitment.

Clinical reference

Mechanism and pharmacokinetics.

Explore the published evidence for the ingredients in Diphenhydramine 480 mg / 100 ml Syrup. Each reference identifies its source formulation and study context. Ingredient studies describe the named reference product; they do not establish the pharmacokinetics, clinical suitability or bioequivalence of this finished formulation.

How to read our product information and sources ↗

Prescribing-label excerpts

Diphenhydramine Hydrochloride

Reference for: Diphenhydramine. Source presentation: solution. Source route: oral.

The source label presents its clinical-pharmacology findings together. These selected passages retain the source’s study context; the full label provides the complete discussion.

Clinical pharmacology

Diphenhydramine hydrochloride is an antihistamine with anticholinergic (drying) and sedative effects. Antihistamines appear to compete with histamine for cell receptor sites on effector cells.

A single oral dose of diphenhydramine hydrochloride is quickly absorbed with maximum activity occurring in approximately one hour. The duration of activity following an average dose of diphenhydramine hydrochloride is from four to six hours. Diphenhydramine is widely distributed throughout the body, including the CNS. Little, if any, is excreted unchanged in the urine; most appears as the degradation products of metabolic transformation in the liver, which are almost completely excreted within 24 hours.

Selected passages from the cited U.S. prescribing label. The studies concern the source product and populations named in each passage; they do not establish Walter-product bioequivalence, an approved indication, or the kinetics of another fixed combination. Tables and the full prescribing information remain available in the source.

Source: DailyMed: Diphenhydramine Hydrochloride — solution

Reference accessed 2026-10-06. Label revision: 2026-08-03.

Manufacturing & packaging brief

Plan the syrup presentation.

Use this preparation guide for Diphenhydramine 480 mg / 100 ml Syrup. These are the decisions to resolve with the technical team before a site, process and commercial scope are confirmed.

Presentation & formulation

Specify the ingredient amounts per stated volume and the separate bottle fill volume. Identify flavour, colour and ingredient exclusions as requirements for review.

Quality & technical transfer

Agree the formula, analytical methods and applicable physical and microbiological specifications. Confirm the basis for any proposed storage or label statement.

Review the technical documents

Packaging configuration

Describe the bottle, closure and measuring cup, spoon or syringe. Ask for the container and measuring accessory to be assessed with the formulation.

Explore packaging options

Details to confirm for this record

Concentration and pack size: The record includes a concentration or percentage expression. Confirm its complete basis, then specify the finished fill volume or weight separately. Do not treat pack size as the strength.

Quantities, MOQ & lead time

For Diphenhydramine 480 mg / 100 ml Syrup, state the bottle count and fill volume, target market and reorder forecast. MOQ and lead time depend on the assessed formula, process, components, testing and project readiness; request those terms in writing.

Discuss this manufacturing brief

Explore the context

Build the right manufacturing brief.

Dosage-form capabilitiesOral liquids Therapeutic navigationRespiratory & allergy Full catalogueSearch other compositions

Common questions

Before you request a quotation.

Diphenhydramine 480 mg / 100 ml Syrup

What is listed in the catalogue?

The catalogue lists Diphenhydramine 480 mg / 100 ml as syrup in its respiratory & allergy navigation area and non-beta-lactam manufacturing stream.

How do you confirm manufacturing availability?

Send Walter your requirement for Diphenhydramine 480 mg / 100 ml Syrup. The team reviews the applicable product permission and unit, formulation and equipment fit, testing, packaging and production schedule before confirming the manufacturing scope in writing. Request the relevant product and facility documents with your enquiry.

What do I need for a quotation?

Share the exact composition and strength, syrup presentation, target market, initial quantity, preferred pack and timing. Identify whether this is a new product, development brief or transfer.

The quotation must confirm MOQ, inclusions, prerequisites and lead time for the proposed product and site.

What is needed for Indian and export markets?

For India, share the intended brand or institutional supply requirement, pack sizes, initial order quantity and artwork needs for Diphenhydramine 480 mg / 100 ml Syrup. Confirm the applicable product permission, manufacturing unit and labelling requirements with the team.

For export, identify each destination country, proposed pack, language and registration or dossier requirements. Ask which product-specific quality and stability documents are available. Container compatibility and destination-market requirements need review; a catalogue record does not establish export registration or a shelf-life commitment.

How do I submit my enquiry?

Use the product-specific enquiry button to carry this composition and dosage form into the form. After a successful submission, a receipt reference confirms that your brief has been saved for review. Use the RFQ checklist to prepare the remaining details.

Technical document review

Which documents can I ask Walter to review?

Ask about manufacturing and packing records, specifications, analytical methods, Certificates of Analysis (COA), stability evidence, the Process Validation Protocol (PVP) and Process Validation Report (PVR). The wider checklist below covers supplier qualification, technical transfer and ongoing supply.

View the full document checklist 14 review areas

Site, licence and audit scope: Manufacturing licence, applicable product permissions, GMP certificates, Site Master File, supplier-qualification questionnaire and relevant audit responses.
Manufacturing, packing and batch release: Master Formula Record (MFR), master packing instructions, Batch Manufacturing Record (BMR), Batch Packing Record (BPR), reconciliation and authorised release records.
Process validation and continued verification: Process Validation Protocol (PVP), Process Validation Report (PVR), process performance qualification documents and continued process verification trends.
Equipment, facilities and utilities: Validation Master Plan (VMP), user requirements, DQ/IQ/OQ/PQ records, calibration and maintenance evidence for relevant equipment and utilities.
Cleaning, carryover and hold times: Cleaning Validation Protocol (CVP), Cleaning Validation Report (CVR), residue limits, recovery studies and applicable clean, dirty and process hold-time studies.
Specifications and analytical evidence: Specifications, Method of Analysis (MOA), Standard Testing Procedure (STP), Certificates of Analysis (COA), analytical validation, verification and method-transfer records.
Stability, packaging and transport: Stability protocols/reports, ongoing stability commitments, pack specifications, approved artwork, compatibility and applicable packaging or transport studies.
Development and technology transfer: Development report, technology-transfer protocol/report, gap assessment, control strategy, critical quality attributes and critical process parameters.
Quality reviews, investigations and changes: Product Quality Review (PQR) / Annual Product Review (APR), deviations, CAPA, change control, OOS/OOT trends, complaints, recalls and relevant SOP/training records.
Material suppliers and impurity risks: API/excipient supplier qualification, traceability, material COAs, relevant origin declarations and impurity risk assessments with supporting tests.
Sterile-product evidence, where applicable: Contamination Control Strategy (CCS), media-fill/aseptic simulation reports, sterilisation and filtration validation, environmental monitoring, sterility/endotoxin and container-closure integrity evidence.
Computerised systems and data integrity: Computerised-system validation, access controls, audit-trail review, backup/restore checks and relevant data-integrity procedures.
Market-specific regulatory support: Applicable dossier sections, API master-file/CEP support, bioequivalence or biowaiver evidence and Certificate of a Pharmaceutical Product (CPP/CoPP), where required and available.
Quality agreement and access arrangements: Quality/technical agreement covering responsibilities, release, changes, subcontracting, investigations, complaints, recalls, audits and document access.

Agree the list for the exact product, site, process, pack, market and project stage. QA confirms what exists, applies and may be shared; some records may require an NDA, redaction or controlled review. See document definitions and review guidance.

Important qualification

This B2B catalogue record is not proof of current approval or confirmation that Diphenhydramine 480 mg / 100 ml Syrup is available for sale. It is not prescribing information or patient advice. Any Drugs Rules status, current approval, exemption, applicable unit, licence scope, formulation, claims, brand use, destination-market registration and commercial feasibility require documentary verification and Walter's written confirmation. Read the full regulatory disclaimer.

Composition and classification are taken from Walter's product catalogue. The manufacturing guide helps buyers prepare a technical brief. Clinical references, where shown, describe the cited product and study. Manufacturing guide updated 8 October 2026.