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Data Science Blog > Data Visualization > Changing Data Trends in the Ingredients of Pain Relievers

Changing Data Trends in the Ingredients of Pain Relievers

Chia-An (Anne) Chen
Posted on Jul 21, 2016
The skills the author demoed here can be learned through taking Data Science with Machine Learning bootcamp with NYC Data Science Academy.

Introduction

Before getting into the market, a new drug application, known as an NDA, must be filed with the U.S. Food and Drug Administration to ensure its safety and effectiveness. FDA has released several files of these NDAโ€™s at the Drug@FDA database. See the graph below for the Entity Relationship Diagram. The data used for this exploratory and visualization project is from the table โ€œApplicationโ€, โ€œProductโ€, and โ€œRegActionDateโ€.

 

Changing Data Trends in the Ingredients of Pain Relievers

To explore and understand the dataset, a plot with the number of approved new drug applications vs. year was created (see below). We can see that the number of approved new drug applications has increased over the decades, and the increasing trend may be consistent with the development of technology in the biomedical field.

Data

 

Changing Data Trends in the Ingredients of Pain Relievers

The rate of approved new drug application was not calculated due to the nature of the data, which consists of only approved cases. The confidentiality for total number of submissions may serve as protection from revealing the names of applicants who submitted an NDA but failed.

The analysis is divided in to three categories to analyze the drugs: active ingredient, form, and potential. This project looks at how factors in each subcategory change over the time period from 1939 to 2016 and checks if there are hidden trends.

 

I. Data on Active Ingredient

Rather than randomly choosing which active ingredients to study, this project focuses on those compounds that are most frequently used. The plot below shows the top ten active ingredients in approved cases, and further analysis focused on these ten.

 

Changing Data Trends in the Ingredients of Pain Relievers

The popularity of these ten ingredients has changed over time, as seen in the graph below. To be noted, the lines do not reflect the actual data but are smooth lines to fit the data in order to avoid noise and more clearly demonstrate the patterns.

 

10_ai_years

On the left is the raw count of the number of approved cases vs. year, and on the right is the normalized plot. To be more specific, the data in each year is normalized with the total count in that year (data in the first plot).

Three patterns are found:

  1. The number of approved drugs that contain Ethinyl Estradiol as an active ingredient, which is usually used in oral contraceptive, has skyrocketed since 1990s.
  1. Dextrose, Sodium Chloride, and Potassium Chloride somehow show the same pattern in the plot. With further investigation, these three are usually combined in use for intravenous injection to provide sugar, restore electrolyte imbalance, and rehydrate the patients. As liquid, this combination of drugs can also serve as diluent for drugs that need to be injected into the vein.
  1. An interesting finding is that the four active ingredients, Acetaminophen, Hydrocodone Bitartrate, Ibuprofen, and Oxycodone Hydrochloride, used in pain relievers, seem to have different patterns, thus the next step is to take a closer look of these four compounds.

Pain Relievers

four_pain

Acetaminophen, Hydrocodone Bitartrate, and Ibuprofen all share similar patterns as having a peak around 1990s then gradually declining afterwards. For Oxycodone Hydrochloride, the trend seems to be going the other way. Since the 1990s there seems to be a steady rise in the use of Oxycodone Hydrochloride.

One hypothesis for this has to do with the pressures on the pharma industry to increase profit margins. Drugs like Acetaminophen, Hydrocodone Bitartrate, and Ibuprofen, are inexpensive and cannot be expected to bring high margins. Under this pressure, it is not surprising that pharma is looking for new compounds, for example, Oxycodone, to market to the public.

Interestingly, the increasing trend of Oxycodone matches with the preference of drug abusers. A nationwide survey conducted by the researchers at Washington University School of Medicine in St. Louis indicates opioid drug abusers favor Oxycodone over other pain relievers. The high Oxycodone produces resulting from its high purity over common pain reliever, like Acetaminophen/Hydrocodone combined drug. If two incidents are correlated in some way, a stricter legislation may be needed to regulate the misuse and abuse of prescribed pain relievers, especially the ones with Oxycodone.

 

II. Form

Besides active ingredients, drugs can be formulated into different forms, like an oral pill or injectable solution. This section provides insight into the changing trend of the forms among the approved drugs. The rationale for data acquisition is similar to the analysis for active ingredients. First, the top ten most popular forms are gathered, and a time series based plot is generated.

 

10_forms

There is a diverging trend for Oral and Injection in forms of drug, and the possible explanation is that people do not like injections if a similar drug in oral form is available. So to make the drug more marketable, those pharmaceutical companies formulate the drug into oral form if possible. Another explanation could lie in the complicated regulation of injectables that shifted industry preference to introduce orals.

 

III. Potential

In general, there are two review types for an NDA, standard and priority. The FDA defines these as follows: standard review stands for a drug with therapeutic qualities that are similar to drugs already in the market, and priority review represents a drug with an advance over therapy that is available to the public.

 

potential_year

As we can see from the plot above, the ratio of normalized review types in approved cases reached a plateau in the 1980s for standard review and remained at quite a steady rate of 75%. For priority review, the rate of approvals seems to have held relatively steady at 25% since 1980. The lower percentage of priority review makes sense because of the difficulty involved in advancing the development of drugs for new or uncured diseases.

 

Data Summary

  • There is an increasing trend in the use of Oxycodone as an active ingredient in filings for new drug applications. However, there is no suitable explanation for this trend.
  • A decreasing trend in applications for injectable drugs versus an increasing trend in oral drugs may reflect the preference of patients for oral drugs. It also might relate to industry preference for introducing orals due to the complexity of regulating injectables.
  • In general, the number of cases with standard review is three times more than the ones with priority review in approved new drug applications.

About Author

Chia-An (Anne) Chen

Anne Chen has a Masters degree in Bioengineering from the University of Pennsylvania. Prior to working at a biotech startup developing a liver cancer diagnosis device, Anne researched and evaluated open-source Electronic Health Records software for small-scale hospitals...
View all posts by Chia-An (Anne) Chen >

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