Common side effects may include: drowsiness; nausea, vomiting, stomach pain, heartburn; diarrhea; .Although not all side effects are known. This is pretty much the same side effects that are shown on almost all the paper work that you are given on prescriped medication at the pharmacy. I talk with my pcp about starting on the 5-HTP supplements, he told me that it was Ok to start on the 5-HTP supps see how they work for me,I asked him if I could take them bought at the same time and he said yes, He told me he was going to suggest the supplements, so I could start tapering off from the .5mg of the Lorazepam, he also said that he has patients that are taking the 5-HTP and that they claim its working good for them, so I just started taking them yesterday evening, so see how it works for me, will keep you posted. I take my .5mg lorazepam in the morning around 8:30-9:00 and take the 5-HTP in the evening around 8:-8:30pm. wish me luck. till next day.