According to the U.S. Bureau of Labor Statistics, prices for prescription drugs were 0.23% lower in 2019 versus 2018 (a $0.02 difference in value).

**Between 2018 and 2019:** Prescription drugs experienced an average inflation rate of -0.23% per year.
In other words, prescription drugs costing $10 in the year 2018 would cost $9.98 in 2019 for an equivalent purchase.
Compared to the overall inflation rate of 1.81% during this same period, inflation for prescription drugs was
lower.

Raw Consumer Price Index data from U.S. Bureau of Labor Statistics for *Prescription drugs*:

Year |
2018 | 2019 |

CPI |
528.008 | 526.785 |

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Below are calculations of equivalent buying power for Prescription drugs, over time, for $10 beginning in 2018. Each of the amounts below is equivalent in terms of what it could buy at the time:

Year | USD Value | Inflation Rate |
---|---|---|

2018 | $10.00 | - |

2019 | $9.98 | -0.23%* |

CPI in 2019 / CPI in 2018 * 2018 USD value = 2019 USD value

Then plug in historical CPI values from above. The CPI for Prescription drugs was 528.008 in the year 2018 and 526.785 in 2019:

526.785 / 528.008 * $10 =

Therefore, according to U.S. Bureau of Labor Statistics, $10 in 2018 has the same "purchasing power" as $9.98 in 2019 (in the CPI category of Prescription drugs).