Like with other services under the public relations umbrella, the answer depends greatly on your organisation’s specific situation: market niche, type of service or product, audience needs and particularities, legal framework within which it operates, cultural specifics, and more.
In our experience, however, it makes a great deal of difference for companies when they work with a PR / marketing agency to launch a new product in the heath sector than when they don’t and rely on issuing press releases.
While press releases can play a role indeed in the larger strategy, in the majority of cases it can’t create momentum or enough exposure for the product or service in question. Multiple tactics and activities need to run in tandem, such as liaising with analysts in your niche, producing a well-optimised website to present the product, running paid campaigns online, and securing coverage in key industry media, among others.