Benzinga's Top #PreMarket Gainers

TherapeuticsMD (NYSE: TXMD) shares surged 32.93% to $5.49 in pre-market trading after FBR Capital Markets initiated coverage on the stock with an “outperform” rating and a $34 price target.

NeuroMetrix (NASDAQ: NURO) shares gained 26.98% to $2.40 in pre-market trading after the company reported that the FDA has cleared its wearable-tech for over the counter use.

Dendreon (NASDAQ: DNDN) shares jumped 5.58% to $2.46 in pre-market trading after gaining 1.75% on Monday.

Groupon (NASDAQ: GRPN) shares gained 3.88% to $6.70 in pre-market trading. B Riley upgraded Groupon from Neutral to Buy and raised the price target from $6.00 to $9.50.