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Friday said the Food and Drug Administration granted priority review status to its experimental antibiotic Tygacil.

Tygacil is the first in a new class of antibiotics, and it is being aimed at serious and complicated infections or against bacteria that have developed a resistance to other antibiotics. In its peak year, analysts estimate the drug could be a $1 billion product.

A priority designation is applied to a drug that, if approved, would be a significant improvement compared with existing treatments. FDA review takes about half the time of the normal 12-month period.

Wyeth is seeking market approval for Tygacil as a treatment for patients with complicated intra-abdominal infections and complicated skin and skin structure infections.

The New Jersey-based drugmaker reports fourth-quarter earnings Monday.

Shares ended at $42.67 Thursday.