That sounds right—300mg. in the whole bottle. But I've never used the stuff; how much is applied at one time? If that 30g bottle is a month supply, that's only 10mg/day.
According to at least one of the studies: (haven't checked others)
Quote:
Blood levels for amitriptyline and ketamine were performed at 7 days to determine whether systemic absorption had occurred.
....
Blood analysis revealed no significant systemic absorption of either agent after 7 days of treatment
http://www.ncbi.nlm.nih.gov/pubmed/12966259
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IIRC from reading, the meds stay pretty much in the area where they're applied, so risk of serotonin syndrome should be extremely low/unlikely, but that should be verified.
Doc