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Important: VAERS reports alone cannot determine if a vaccine caused an adverse event. Reports may contain incomplete, inaccurate, or unverified information. Correlation does not equal causation.

Drug ineffective

29,868 total reports4.8% serious outcomes

Drug ineffective appears in 29,868 VAERS reports across all vaccines. Of these, 212 reports also mentioned death and 1,230 involved hospitalization. The severity rate (deaths + hospitalizations as a percentage of reports) is 4.8%. The top vaccines associated with this symptom are COVID-19, Chickenpox (Varivax), Hepatitis B. Remember: VAERS reports show temporal association, not causation.

29,868

Total Reports

212

Deaths

1,230

Hospitalizations

4.8

Severity Rate

% serious outcomes

About Drug ineffective Reports

Drug ineffective has been reported 29,868 times in VAERS from 1990 to 2026.

Of these reports, 212 were associated with death (0.71%) and 1,230 involved hospitalization.

The overall serious outcome rate (death or hospitalization) for reports mentioning Drug ineffective is 4.8%.

Understanding Drug ineffective in VAERS

•Temporal association only: These reports show Drug ineffective occurred after vaccination, not necessarily because of vaccination.

•Background rates matter: Many symptoms occur naturally at baseline rates in the population, unrelated to vaccination.

•Reporting variability: Medical terminology may be used differently by various healthcare providers and over time.

•Investigation needed: High-frequency reports may trigger further epidemiological studies to determine causation.

What This Data Shows

Most Associated Vaccines: The vaccines most frequently mentioned in reports with Drug ineffective. This may reflect usage patterns, not causation.

Severity Patterns: The percentage of reports that involve serious outcomes can help prioritize safety investigations.

Reporting Trends: Changes in reporting frequency over time may reflect increased awareness, media attention, or actual safety signals.