(Adds details on results)
April 24 (Reuters) - Drugmaker Biogen Inc reported a 20 percent rise in first-quarter profit on Wednesday, driven by higher sales of its muscle disease treatment Spinraza.
Spinal muscular atrophy treatment Spinraza brought in $518 million in the quarter, beating Refinitiv IBES estimates of $486.4 million.
Multiple sclerosis drug Tecfidera, which brought in $999 million in the quarter, missed estimates, and faces several challenges to its intellectual property, which is key to shielding the blockbuster drug from generic competition.
Net income attributable to the company rose to $1.41 billion, or $7.15 per share, in the quarter ended March 31, from $1.17 billion, or $5.54 per share, a year earlier. (bit.ly/2L1UlKL)
On an adjusted basis, the company earned $6.98 per share.
Total revenue rose to $3.49 billion, beating estimates of $3.39 billion. (Reporting by Manojna Maddipatla and Saumya Sibi Joseph in Bengaluru; Editing by Shounak Dasgupta)