Anaheim-based drug maker Questcor Pharmaceuticals Inc. continued its rise following the release of better-than-expected second-quarter results earlier this week that were driven by strong sales of its sole drug.

Shares of Questcor were up about 5% in afternoon trading Thursday to a market value of $4.03 billion after closing up about 10% on Wednesday.

Second-quarter profit jumped to $83 million, up 96% from 2012’s second quarter and surpassing analysts’ consensus forecast of $61.5 million.

The company said its second-quarter sales grew 64% to $184.6 million, higher than forecasts of $169 million. Questcor said it shipped 7,050 vials of its H.P. Acthar Gel in the second quarter, 46% more than in first quarter.

Questcor released its results after the market closed on Tuesday.

Acthar has various uses, including treating nephrotic syndrome, which is a kidney disorder, multiple sclerosis flare-ups, rheumatoid arthritis, and infantile spasms, a rare form of epilepsy.

Analysts had raised concerns about Acthar after West Hartford, Conn.-based insurer Aetna Inc. said that it was medically necessary only to treat infantile spasms.