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Table 2 Summary of linked prescriptions (pharmacy and GP database) for the two analyses: branded prescriptions that can be potentially substituted generically (generic substitution analysis) and generic prescriptions that can be potentially substituted by a branded product (branded substitution analysis)

From: Analyzing generic and branded substitution patterns in the Netherlands using prescription data

 

Generic substitution analysis

Branded substitution analysis

No. of linked prescriptions

17,204

36,695

No. of prescriptions (%) on:

  

   • ACE inhibitors

6,068 (35.27)

10,259 (27.96)

   • Antidepressants

4,626 (26.9)

11,760 (32.04)

   • PPIs

3,788 (22.03)

8,187 (22.32)

   • Statins

2,721 (15.81)

6,491 (17.68)

Average prescription- delivery lag in days (SD)

0.48 (0.84)

0.41 (0.91)

Average duration after patent expiry in months (SD)

27.47 (12.83)

35.07 (19.84)

No. of pharmacies

26

26

Individual pharmacy a

18

19

Pharmacy in a partnership a

8

9

Pharmacy in a chain a

5

7

No. sample patients

1,423

3,855

Female patients (%)

819 (57.6)

2,215 (57.5)

Average age in years (SD)

61.05 (15.15)

57.96 (16.6)

  1. a Pharmacy ownership status can vary over time for each pharmacy
  2. SD = standard deviation