Meath were six-point ahead at halftime with a forward line getting plenty of ball from midfielders Brian Meade and Mark Ward.
Veteran Graham Geraghty came on for Gilsenan for Meath in the 54th minute.
Westmeath were reduced to 14 men when Michael Ennis was sent on for a second yellow card offence in the second half and Meath went on to win by 12 points.
Meath: D Gallagher; B Menton, C Lenehan (0-1), G O'Brien; S McAnarney (0-1), M Burke, C McGuinness (0-1); B Meade (0-2), M Ward (0-1); C O'Connor, S Bray (0-5), G Reilly (0-3); P Gilsenan, S Kenny (0-1), C Ward (0-2). Subs: J Sheridan for C Ward (44), G Geraghty for Gilsenan (54), K Reilly for O'Brien (60), D Tobin for Lenehan (62), C King for Burke (68).
Westmeath: G Connaughton; A Finnan, K Gavin, D McDermott; R Foley, M Ennis (0-1), K Maguire; T English, P Bannon; P Sharry, D Glennon, P Sheridan; A Giles (0-1), K Martin (0-2), C McCormack (0-1). Subs: D Daly for English (43), K Sheridan for Bannon (47), M Gorman for Giles (49), B Moran for Glennon (57), A Stone for Sharry (60).


