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GeoPharma

( GORX) sank 12.5% to $3.08 following its earnings report Thursday. The company earned $195,000, or 2 cents a share, in the quarter compared with $515,000, or 5 cents a share, a year ago. Excluding stock options expenses, the company earned 6 cents a share. Revenue reached $14.4 million, up 22.3% from a year ago.

Oscient Pharmaceuticals

(OSCI)

got a boost after the company agreed to allow

Abbott

(ABT) - Get Abbott Laboratories Report

to market its Factive bronchitis drug in Canada. Specific financial terms were not disclosed. Shares were up 2.2% to $1.20.

Advancis Pharmaceutical

( AVNC) rose after the company reported positive trial results on its anti-infective drug amoxicillin Pulsys. The stock was higher by 43.9% to $4.49.

Tenet Healthcare's

(THC) - Get Tenet Healthcare Corporation Report

shares jumped following its quarterly report after the close of trading Wednesday. While the company reported a wider loss of $398 million, or 85 cents a share, in the second quarter, compared with a loss of $33 million, or 7 cents a share, a year earlier, excluding hefty one-time charges, earnings beat analysts' estimates. Tenet had adjusted earnings of 4 cents a share, compared with 3 cents analysts were expecting. Shares were up 12.5% to $6.56.

Among other health stocks on the move were

Dynavax Technologies

(DVAX) - Get Dynavax Technologies Corporation Report

TheStreet Recommends

, up 9.1% to $4.33,

Xenoport

(XNPT)

, up 8.2% to $18.15,

Cytokinetics

(CYTK) - Get Cytokinetics, Incorporated Report

, gaining 7.6% to $5.81, and

Medicure

( MCU), higher by 6.6% to $1.62.

Celgene

(CELG) - Get Celgene Corporation Report

was down 3.4% to $41.37,

EP Medsystems

( EPMD) fell 8.7% to $1.37, and

Allied Healthcare International

( AHCI) lost 13% to $2.