Stricter deceptive similarity test applies to medicinal products; overall confusion among ordinary purchasers remains the key inquiry.

Passing off actions involving medicinal products require a stricter scrutiny because even a possibility of confusion may seriously endanger health. The court must assess deceptive similarity by comparing the marks as a whole and by asking whether an ordinary purchaser of average intelligence and imperfect recollection is likely to be misled. Greater weight attaches to phonetic and visual resemblance, the nature and character of the goods, the class of purchasers, the mode of purchase, and surrounding circumstances. Differences in get-up or isolated components cannot dilute overall similarity where the marks sound or look alike.

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Issues: Whether, in a passing off action concerning medicinal products, the court should apply a stricter standard for deceptive similarity and what factors should govern the assessment of confusion.

Analysis: The law of passing off turns on misrepresentation likely to injure another trader's goodwill, and the inquiry focuses on whether the competing marks, considered as a whole, are likely to deceive or cause confusion. In medicinal products, the Court held that greater vigilance is required because confusion may have harmful or even fatal consequences, and the ordinary purchaser in India cannot be equated with a highly literate or English-speaking consumer. The proper approach is not to minimise similarity by isolating different components or by giving undue weight to differences in get-up when the marks themselves may sound alike or look alike. The Court also disapproved the view that differences in essential features should override the overall similarity test in such cases. The assessment must take into account the nature of the marks, degree of resemblance, nature of the goods, character of the goods, class of purchasers, mode of purchase, and surrounding circumstances.

Conclusion: A stricter test applies to medicinal products, and deceptive similarity must be judged on the overall likelihood of confusion among ordinary purchasers, with special emphasis on phonetic and visual resemblance and the risk to public health.

Ratio Decidendi: In a passing off action involving medicines, the decisive question is whether the marks as a whole are deceptively similar to an ordinary purchaser of average intelligence and imperfect recollection, and the standard of scrutiny must be stricter because even a possibility of confusion may seriously endanger health.

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