What happened Shares of Supernus Pharmaceuticals (NASDAQ: SUPN), a profitable commercial-stage biopharma focused on diseases of the central nervous system, dropped 11% as of 2:35 p.m. EDT on Wednesday. The selling is attributable to the release of the company's mixed second-quarter results. So what Here's an overview of the headline numbers from Supernus' second quarter: Revenue increased 31% to $99.5 million. The gain was driven by a 36% jump in sales of the epilepsy drug Trokendi XR and a 19% rise in Oxtellar XR. By contrast, Wall Street was looking for $101 million in total revenue. GAAP earnings per share jumped 78% to $0.57. This result was far higher than market watchers' prediction of just $0.43. Image source: Getty Images. Management also took the opportunity to adjust its financial guidance for the full year: Sales are expected to land between $385 million and $400 million. This is an increase over its prior guidance range of $375 million to $400 million in total sales. Operating earnings are forecast to come between $130 million and $140 million. This is a $5 million boost over its previous range. Despite posting good-looking results and modestly boosting guidance, traders appear to be squarely focused on the slight miss on the top line. Now what Supernus has been a red-hot stock for many years -- shares are up 621% since 2013 -- so it isn't too surprising to see it taking a step back in light of the mixed quarterly results. However, revenue and earnings growth of 31% and 78%, respectively, are very strong in absolute terms, so I think that long-term investors should continue to feel good about this company's chances moving forward. 10 stocks we like better than Supernus PharmaceuticalsWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has quadrupled the market.* David and Tom just revealed what they believe are the 10 best stocks for investors to buy right now... and Supernus Pharmaceuticals wasn't one of them! That's right -- they think these 10 stocks are even better buys. Click here to learn about these picks! *Stock Advisor returns as of August 6, 2018Brian Feroldi has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.