CVS Health Corp.’s drug-benefits unit negotiated a deal to make Novo Nordisk A/S’s Wegovy more widely available to its members, a blow to rival Eli Lilly & Co.’s Zepbound that was moved off the company’s list of preferred drugs.

In addition to eliciting greater weight loss than Novo Nordisk’s Wegovy, Eli Lilly’s Zepbound does not come at the expense of safety, according to newly released comprehensive tolerability data—findings that Leerink Partners said confirm the GLP-1 drug’s edge in the closely watched market race.

Eli Lilly said on Sunday its drug Zepbound was superior to Novo Nordisk's Wegovy across five weight-loss targets such as reducing waist circumference, citing data from a head-to-head trial. The data is the first head-to-head trial comparing the wildly popular medicines,