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You are lucky that you are having only reduced volume of semen as a side effect. Most of the people taking this drug have retrograde ejaculation - means semen goes into the bladder instead of outside which later comes in the urine.So there is complete absence of semen during ejaculation.
It is a very common side effect of this drug and usually a reversible one. Very rarely it might persist even after stoppage of the drug.
If you have any queries regarding this issue , please let me know.