WEST BROM 2 NEWCASTLE 2
Darlow, Yedlin, Lejeune, Clark, Mbemba, Hayden (Shelvey 80), Merino, Ritchie, Pérez, Murphy (Aarons 64), Joselu (Mitrovic 73)
Subs: Elliot, Gayle, Diamé, Manquillo
West Brom conceded a two-goal lead to miss out on the chance of a first league win since August as Newcastle ended a run of four straight defeats.
Jonny Evans' own goal saw Rafael Benitez's side draw level after Hal Robson-Kanu and Sam Field had put the home side ahead.
Newcastle improved after Ciaran Clark quickly pulled one back, with Salomon Rondon diverting a corner onto the unlucky Evans and then into the net for the equaliser.
West Brom, who will appoint Alan Pardew as their new manager on Wednesday, move up to 16th while Newcastle go 12th.
Gary Megson has been the Baggies' caretaker boss for the past two games since the sacking of Tony Pulis.
West Brom also conceded a lead in the 1-1 draw with Tottenham on Saturday and they looked to be firmly in charge when 19-year-old midfielder Field converted Matt Phillips' cross for his first goal for the club.
Newcastle hit back almost immediately when Clark headed in from a corner and the captain's goal transformed Benitez's side, who fought back to end the Spaniard's longest losing steak as a Premier League manager.
Megson, who was previously manager at The Hawthorns from 2000 to 2004, has overseen a change in mood even if he couldn't deliver a much-needed win.
Prior to the match, Megson said: "I'm just doing the job for as long as I'm told, and then we'll see what happens after that"
Ex-Newcastle boss Pardew will inherit an improved situation on and off the pitch thanks to Megson's brief tenure.
The chant of "one Gary Megson" could be heard several times from the home fans, grateful to see some spirit on home soil following the 4-0 capitulation to Chelsea 10 days ago.
The 58-year-old's two games in charge so far have only earned two points, but he has installed some of the hard-to-beat qualities normally associated with Tony Pulis sides that had evaporated before his sacking on 20 November.
West Brom had purpose going forward, with the recalled Robson-Kanu their most menacing threat, although Rondon had struck the bar from long range before the Wales international's header.
But they seemed to run out of steam after allowing Clark to rise to Matt Ritchie's corner, and spent most of the remaining half-hour firmly on the back foot.
Benitez's reaction to Saturday's insipid 3-0 home defeat by Watford was to make five changes, including dropping goalkeeper Rob Elliot and bringing in Karl Darlow for his first Premier League appearance of the season.
Mikel Merino, recalled to the starting line-up, helped Newcastle take a grip and had 84 touches - the most of anyone on the pitch at The Hawthorns
Rafa did not get a reaction in the first half and was furious when his side went behind in first-half stoppage-time.
The Spaniard's mood was not improved by Field's close-range strike, but Clark's quick riposte helped transform his side's approach.
The introduction of Aleksandar Mitrovic gave the Magpies even more bite, and in the latter stages they looked the likelier to grab three points, with 63 per cent of possession in the last 15 minutes.