I have experienced both with Phen and Reductil. Both of these medicine I bought from www.meridiareductil.com, never had problem with them. I started taking phentermine two years ago. Because I wouldn't eat since I wasn't hungry at all I lost about 25-30 within a couple of months and I was excited I took it but hated taking it due to the headaches. This medicine it's great, but short time. My experience with Reductil is also great..only dry mouth but it goes away with water. As for me, both of these products are good and really effective...but I mostly like Reductil because of no serious side effects. Regarding the effects I can say that it varies from person to person. So, until you won't try this medicine, you will not know how this medicine will work for you.