Drehmel had a degree in electronics and was an officer in the National People's Army. At the end of his career in 1977 he became a youthcoach for long and triple jump athletes. At the demise of the GDR he lost this position, and later joined the state sports association in the state of Brandenburg. At present he is the honorary jumping coach at SCPotsdam. He resides in Stahnsdorf near Potsdam.