Start at 0.25mg for 1 month. This will help with nausea. The next month stick with 0.5mg. You should discard the pen after 2 months but most guys just blast the last 1mg on the 9th week. This way none of the pen goes to waste.So you only dose it once a week? Thanks this stuff is kinda confusing. So one pen lasts a month or two months if doing 0.5 a week? So three pens be good start to loose 30 pounds about?