Brief Legal News Write-Up
Glenmark Pharmaceuticals Ltd. v. Zenlabs India & Anr.
Date of Judgment: 15.06.2026 : Case No.: Commercial IP Suit No. 535 of 2016 : Neutral Citation: 2026:BHC-OS:13163 : Court: High Court of Judicature at Bombay, Ordinary Original Civil Jurisdiction : Hon'ble Judge: Justice Arif S. Doctor
The Court considered a dispute concerning trademark infringement and passing off in relation to medicinal products marketed under the marks “ZINOX” and “ZENOX”. The case arose from allegations that the defendants were manufacturing and selling pharmaceutical products under the mark “ZENOX”, which was deceptively similar to the plaintiff’s registered trademark “ZINOX”.
The principal question before the Court was whether the defendants’ use of the mark “ZENOX” amounted to trademark infringement and passing off, particularly in the context of medicinal products where a higher standard of scrutiny is required.
After examining the material on record and the submissions of the parties, Justice Arif S. Doctor observed that the plaintiff had established valid and subsisting trademark rights in “ZINOX” and had demonstrated extensive commercial use of the mark. The Court found that “ZENOX” and “ZINOX” were visually and phonetically similar, differing only by the substitution of one letter, and that such similarity was likely to cause confusion among consumers.
The Court held that the defendants had infringed the plaintiff’s trademark and were guilty of passing off, emphasizing that even a slight possibility of confusion in medicinal products must be avoided because it may pose risks to public health.
Accordingly, the Court decreed the suit in favour of the plaintiff, granted a permanent injunction restraining use of the impugned mark “ZENOX”, and awarded costs of ₹5,00,000 against each defendant.
Disclaimer: Readers are advised not treat this as a substitute for legal advise as it is based on limited information and is intended solely for general informational purposes.
Bombay High Court Grants Permanent Injunction Against Use of “ZENOX” Mark in Pharmaceutical Trademark Dispute
Introduction
The Bombay High Court’s judgment in Glenmark Pharmaceuticals Ltd. v. Zenlabs India & Anr. reinforces the stringent standards applicable to trademark disputes involving medicinal and pharmaceutical products. The decision highlights the importance of protecting consumers from confusion in the healthcare sector and reiterates the principle that even minor similarities between competing pharmaceutical trademarks may justify judicial intervention.
The ruling is significant for pharmaceutical companies, trademark owners, healthcare professionals, and intellectual property practitioners. It demonstrates the judiciary’s continuing commitment to safeguarding public health while protecting valuable trademark rights acquired through registration and long-standing commercial use.
The judgment also provides important guidance on the assessment of deceptive similarity, phonetic resemblance, and the consequences of adopting a mark that closely resembles an established pharmaceutical trademark.
Factual and Procedural Background
Glenmark Pharmaceuticals Ltd., the plaintiff, instituted a commercial intellectual property suit alleging infringement of its registered trademark “ZINOX” and passing off by the defendants. The plaintiff asserted that it was the registered proprietor of the trademark “ZINOX” in Class 5 and had been using the mark extensively in connection with medicinal and pharmaceutical preparations. The trademark registration was originally obtained in 2007 and remained valid and subsisting through subsequent renewal.
The plaintiff produced evidence demonstrating continuous commercial use of the mark, including sales records, invoices, promotional expenditure records, and certifications supporting the reputation and goodwill associated with “ZINOX”. The plaintiff contended that the mark had acquired distinctiveness and was exclusively associated with its products in the pharmaceutical market.
The dispute arose when the defendants began manufacturing and marketing pharmaceutical products under the mark “ZENOX”. According to the plaintiff, the impugned mark was deceptively similar to “ZINOX” and was likely to mislead consumers and members of the trade. Despite entering appearance, the defendants failed to file a written statement, did not contest the plaintiff’s evidence, and did not cross-examine the plaintiff’s witness. Consequently, the plaintiff’s evidence remained unchallenged.
The matter ultimately proceeded for adjudication before the Bombay High Court.
Dispute Before the Court
The principal issue before the Court was whether the defendants’ use of the mark “ZENOX” in relation to pharmaceutical products infringed the plaintiff’s registered trademark “ZINOX” and constituted passing off.
The plaintiff argued that the two marks were nearly identical in appearance and pronunciation and that the defendants had deliberately adopted the impugned mark to exploit the goodwill and reputation attached to the plaintiff’s trademark. It was further contended that the products involved were medicinal preparations and, therefore, any possibility of confusion could have serious consequences for public health.
The Court was also required to determine whether the plaintiff had established entitlement to injunctive relief, damages, and costs.
Reasoning and Analysis of the Court
The Court first examined the plaintiff’s trademark rights and found that the plaintiff was the registered proprietor of the mark “ZINOX”, with valid and subsisting registration. The evidence on record established continuous use of the mark and demonstrated that it had acquired substantial goodwill and distinctiveness in the pharmaceutical market.
While assessing deceptive similarity, the Court relied upon the principles laid down by the Supreme Court in K. R. Chinna Krishna Chettiar v. Shri Ambal & Co., Madras & Anr., (1969) 2 SCC 131. In that decision, the Supreme Court emphasized that trademark comparison must consider not only visual resemblance but also phonetic similarity and the overall likelihood of confusion. The Court noted that similarity in sound may be sufficient to create deception even where visual differences exist.
The Court also referred to Hiralal Prabhudas v. Ganesh Trading Company & Ors., 1983 SCC OnLine Bom 284, where the Bombay High Court recognized that substantial phonetic similarity between marks could mislead ordinary purchasers and cause confusion.
Particular reliance was placed on the landmark Supreme Court judgment in Cadila Health Care Ltd. v. Cadila Pharmaceuticals Ltd., (2001) 5 SCC 73. In that case, the Supreme Court laid down various factors for determining deceptive similarity and stressed that a stricter standard applies where medicinal products are involved because mistakes may have life-threatening consequences. The Court reproduced and applied the principles concerning the nature of marks, similarity of goods, class of purchasers, mode of purchase, and surrounding circumstances.
Applying these principles, the Court observed that the rival marks differed only by replacement of the letter “I” with “E”. The marks were visually similar and effectively homophonous. The Court concluded that consumers, pharmacists, and persons involved in the pharmaceutical trade could easily be misled into believing that the products originated from the same source.
The Court further found that the defendants had failed to provide any explanation for adopting the impugned mark. Their conduct in not contesting the proceedings and not producing any defence strengthened the inference that adoption of the mark was dishonest and intended to capitalize upon the goodwill associated with the plaintiff’s trademark.
The Court emphasized that where medicinal products are involved, courts must adopt an especially cautious approach because confusion between competing pharmaceutical products can affect public health and safety. Consequently, the slightest possibility of deception must be avoided.
Although the plaintiff sought damages of ₹5,00,000, the Court declined to grant damages due to absence of specific evidence establishing the extent of loss suffered. However, considering the defendants’ conduct and the nature of the infringement, the Court found it appropriate to award substantial costs.
Final Decision of the Court
The Bombay High Court decreed the suit in favour of Glenmark Pharmaceuticals Ltd. and granted permanent injunctive relief restraining the defendants from using the trademark “ZENOX” or any other deceptively similar mark in relation to pharmaceutical and medicinal products.
The Court held that the defendants had committed trademark infringement and passing off. While the claim for damages was rejected for lack of evidence, the Court awarded costs of ₹5,00,000 against each defendant, payable within eight weeks, with interest at 8% per annum in the event of default. The suit was accordingly disposed of.
Point of Law Settled
The judgment reaffirms that in cases involving medicinal and pharmaceutical products, courts must apply a stricter standard while assessing deceptive similarity between competing trademarks.
The decision reiterates that phonetic similarity can be as important as visual similarity and that even minor differences between pharmaceutical trademarks may not be sufficient to avoid confusion. The Court also reaffirmed the principle laid down in Cadila Health Care Ltd. v. Cadila Pharmaceuticals Ltd. that public health considerations demand heightened protection against deceptive pharmaceutical branding.
The ruling further demonstrates that failure to contest infringement proceedings may strengthen the inference of dishonest adoption and justify award of substantial costs against the infringing party.
Case Details:
Title of the Case: Glenmark Pharmaceuticals Ltd. Vs. Zenlabs India & Anr.
Date of Judgment/Order: 15.06.2026
Case Number: Commercial IP Suit No. 535 of 2016
Neutral Citation: 2026:BHC-OS:13163
Name of Court: High Court of Judicature at Bombay, Ordinary Original Civil Jurisdiction
Name of Hon'ble Judge: Justice Arif S. Doctor
Written By: Advocate Ajay Amitabh Suman, IP Adjutor [Patent and Trademark Attorney], High Court of Delhi
Disclaimer: Images used herein do not reflect actual images used in Judgement and that the same are for illustrative purpose only. Readers are advised not to treat this as substitute for legal advice as it may contain errors in perception, interpretation, and presentation.
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Headnote of the Judgment:
Glenmark Pharmaceuticals Ltd. v. Zenlabs India & Anr., High Court of Judicature at Bombay, Commercial IP Suit No. 535 of 2016, decided on 15.06.2026. The plaintiff sought a permanent injunction against the defendants for using the mark “ZENOX” in relation to pharmaceutical products, alleging infringement of its registered trademark “ZINOX” and passing off. The Court found that the rival marks were visually and phonetically similar and that use of the impugned mark was likely to cause confusion, particularly because the products were medicinal in nature. Applying the principles laid down in Cadila Health Care Ltd. v. Cadila Pharmaceuticals Ltd., the Court held that stricter standards apply in pharmaceutical trademark disputes. The suit was decreed, permanent injunction was granted, and costs of ₹5,00,000 were imposed on each defendant.
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