Corrects company name to Avadel from Advel in headline
** Shares of Avadel Pharmaceuticals AVDL.O surge 21.7% to $23.44 premarket after the drugmaker gets unsolicited proposal from Lundbeck
** AVDL set to open at its highest since September 2025, if gains hold
** Danish drugmaker Lundbeck offers up to $23/shr for Avadel, including $21 cash plus up to $2 tied to sales milestones
** Offer comes weeks after Alkermes ALKS.O agreed to buy Avadel in $2.1 bln deal to enter sleep medicine market
** Avadel says Lundbeck bid could qualify as "company superior proposal" under agreement with Alkermes
** AVDL stock up 83.06% YTD, as of last close
(Reporting by Tharuniyaa Lakshmi in Bengaluru)
((tharuniyaa@thomsonreuters.com))