Buy 5 drugs, activate one.
Put the left 4 in your skill bar for example on slot 0.
Then go to teleporter and press "Select teleport area".
Right click the activated Speed Drug now. Sro will ask you for closing the Speed Drug.
Press Yes and press in the same time 0 (the other speed drug) and teleport button.
When you are in the next town you have one running speed drug and one with an "X". Do the same thing again.
Ne kadar doğru bilmiyorum denemedim.