Mercury Drug v. De Leon: dispensing errors and patient reliance

Facts and context

Raul De Leon consulted his physician friend about a red, irritated eye. The physician prescribed Cortisporin Ophthalmic and Ceftin. De Leon presented the written prescription at a Mercury Drug branch, where pharmacist assistant Aurmela Ganzon supplied Cortisporin Otic Solution—ear drops.

When the drops were applied to his eye, De Leon felt searing pain that persisted after rinsing. He discovered the dispensing error and returned to the branch. Ganzon said she could not fully read the prescription; her supervisor apologized and explained that the prescribed ophthalmic product was not in stock. De Leon subsequently sought a written explanation and apology, then sued for damages.

Mercury Drug argued that De Leon should have read the label, that only the otic preparation was available, and that the prescription lacked required identifying details. The trial court found negligent dispensing. The Court of Appeals dismissed the pharmacy’s appeal for deficiencies in its brief, including missing page references. The Supreme Court addressed both the appeal’s procedural treatment and the merits.

Issue

Did uncertainty about the prescription, lack of stock, or the patient’s failure to read the label excuse dispensing ear drops for his eye complaint? Was dismissal of the appeal for its briefing defects justified?

Ruling and doctrine

The Supreme Court allowed consideration of the appeal’s merits but sustained liability for gross negligence. It reduced moral damages from ₱100,000 to ₱50,000 and exemplary damages from ₱300,000 to ₱25,000. The grant of partial relief on appeal did not clear the pharmacy of responsibility.

The pharmacy had to exercise care commensurate with the danger of dispensing medicines. Ganzon should have verified what was prescribed, consulted her supervisor, or refused the purchase if the necessary certainty could not be obtained. The fact that an otic product was the only available preparation did not justify assuming it was the intended medicine.

De Leon relied on the pharmacy’s specialized knowledge. His failure to read the label did not excuse the earlier dispensing error or shift responsibility for it to him. Mercury Drug also failed to rebut the presumption of negligence in selecting or supervising its employee. The Court drew on its earlier ruling in Mercury Drug v. Baking, involving a sedative supplied instead of diabetes medication.

On procedure, dismissal of an appeal for briefing defects under Rule 50 was discretionary. Although the brief lacked exact page references, its references to exhibits, transcripts, and attachments enabled review. The Court therefore considered the substantive dispute rather than allowing the procedural dismissal to determine the outcome.

Practice implications

Parao Law practice guidance

For physicians

• Specify the intended preparation and route clearly, especially where similar product names have ophthalmic, otic, oral, or other formulations.
• A clarification request from the pharmacy is an opportunity to prevent injury. Resolve uncertainty through a documented communication rather than assuming a substituted formulation is equivalent.
• If a dispensing injury occurs, preserve the prescription, container, label, dispensing record, and clinical findings. Establish what was prescribed and what was actually administered.

For hospitals and clinics

• Require staff to resolve ambiguous prescriptions and unavailable formulations before dispensing. Patient checking is an additional safeguard; it does not replace the dispensing professional’s responsibility.
• Provide a clear escalation route and retain incident documentation and the patient’s complaint.

For lawyers

• Connect the prescription, supplied product, administration, and injury with evidence. Examine the employer’s actual selection and supervision practices.
• Preserve the procedural history: the Supreme Court relaxed the appeal’s treatment while retaining liability and reducing damages.

Limits of the ruling

This is a pharmacy civil-liability case. It does not establish that patient conduct is irrelevant in every negligence action, or that the prescribing doctor was adjudged negligent. Its value alongside Baking is the Court’s specific treatment of uncertain dispensing and a patient’s reliance on the pharmacy.