LONDON — Conquering alcoholism can be a life-long struggle, and it is very common for recovering excessive drinkers to suffer relapses on the road to sobriety. While undergoing this recovery process, many will seek out a number of abstinence strategies in an effort to find what works for them. Now, a new study is offering up a potentially game-changing option for heavy drinkers searching for a way to curb their alcohol use: ketamine.