By Martinne Geller LONDON (Reuters) – Consumer items group Reckitt Benckiser is reviewing options for its prescription drugs unit, it stated on Tuesday, successfully placing up for sale its prescription medicine for heroin habit, which faces low cost, copycat competition. Shares within the British firm rose over 4.5 percent in early trading. Financial institution of The united states Merrill Lynch has valued the pharmaceuticals unit at about 2 billion kilos ($3.2 billion). The industry facilities across the drug Suboxone, which Reckitt sells as a film that dissolves within the mouth. …