If you're gonna venture into hard sci-fi like time travel and experimental drugs then you have to define a set of rules and stick to them...even if they aren't spelled out on screen, the writer needs to at least have a firm grasp of how everything all works...this movie constantly sets a rule of time travel, even states it out right and then a minute later shows that rule not being adhered to, it ruins that whole point and draw of this movie, the inconsistencies muddle any focus you may have built up each time you think you understand the mechanics, that by the end it feels that all the learning about time travel we did most of the movie didn't really mean anything and the writers just wanted to make some cool scenes and then say oh yeah let's write an ending too, one minute.....even the real world human drama storyline are lost in the mix....3 stars for the cinematography, the actors, and the balls to make a whole movie with only a couple of ideas for a not quite there story.
Review of Synchronic
