** International Paper's IP.N shares down 8% at $49.62 premarket, after co misses Q2 profit estimates on higher input costs
** Co reports adjusted profit of 20 cents per share, well below analysts' average estimate of 41 cents per share, according to LSEG estimates
** IP says its margins were affected due to higher costs and muted demand in Europe
** However, co reports Q2 net sales beat
** As of last close, IP stock up 17% in last 12 months
(Reporting by Anshi Sancheti)
((Anshi.Sancheti@thomsonreuters.com))