IDEAS home Printed from
   My bibliography  Save this paper

Entry of New Drugs and doctors' Prescriptions


  • Andrea Coscelli

    (Lexecon Ltd)


This paper is about entry of new drugs in pharmaceutical markets. More specifically, I analyze the diffusion of new drugs among doctors. My empirical analysis uses non-parametric duration models, which are flexible enough to identify the most important covariates influencing the doctors' adoption decisions. My results peak to issues such as why generic drugs do not have large market shares in post-patent drug markets. When I analyze entry of bio-equivalent products, I find that the doctors' past dispersion across drugs in a therapeutic market is the best predictor of the likelihood of adoption. When a new presentation form is introduced by an incumbent firm, the doctors who extensively prescribed the brand in the other presentation forms are the ones most likely to adopt the new drug. Finally, I find that doctors are not firm-loyal in their prescribing behaviour across therapeutic markets.

Suggested Citation

  • Andrea Coscelli, 1996. "Entry of New Drugs and doctors' Prescriptions," Royal Holloway, University of London: Discussion Papers in Economics 98/13, Department of Economics, Royal Holloway University of London, revised Jan 1998.
  • Handle: RePEc:hol:holodi:9813

    Download full text from publisher

    File URL:
    Download Restriction: no

    References listed on IDEAS

    1. Heyes, Anthony G., 1996. "Cutting environmental penalties to protect the environment," Journal of Public Economics, Elsevier, vol. 60(2), pages 251-265, May.
    2. Nowell, Clifford & Shogren, Jason F, 1994. "Challenging the Enforcement of Environmental Regulation," Journal of Regulatory Economics, Springer, vol. 6(3), pages 265-282, September.
    3. Haltiwanger, John & Waldman, Michael, 1991. "Responders versus Non-responders: A New Perspective on Heterogeneity," Economic Journal, Royal Economic Society, vol. 101(408), pages 1085-1102, September.
    4. Xepapadeas, A. P., 1995. "Observability and choice of instrument mix in the control of externalities," Journal of Public Economics, Elsevier, vol. 56(3), pages 485-498, March.
    5. Magat, Wesley A & Viscusi, W Kip, 1990. "Effectiveness of the EPA's Regulatory Enforcement: The Case of Industrial Effluent Standards," Journal of Law and Economics, University of Chicago Press, vol. 33(2), pages 331-360, October.
    6. Harrington, Winston, 1988. "Enforcement leverage when penalties are restricted," Journal of Public Economics, Elsevier, vol. 37(1), pages 29-53, October.
    7. Brian Erard & Jonathan S. Feinstein, 1994. "Honesty and Evasion in the Tax Compliance Game," RAND Journal of Economics, The RAND Corporation, vol. 25(1), pages 1-19, Spring.
    8. Gray, Wayne B. & Deily, Mary E., 1996. "Compliance and Enforcement: Air Pollution Regulation in the U.S. Steel Industry," Journal of Environmental Economics and Management, Elsevier, vol. 31(1), pages 96-111, July.
    9. Haltiwanger, John & Waldman, Michael, 1993. "The role of altruism in economic interaction," Journal of Economic Behavior & Organization, Elsevier, vol. 21(1), pages 1-15, May.
    Full references (including those not matched with items on IDEAS)

    More about this item

    JEL classification:

    • L10 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - General
    • I10 - Health, Education, and Welfare - - Health - - - General


    Access and download statistics


    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:hol:holodi:9813. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Claire Blackman). General contact details of provider: .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.