Across 265 first-hand reports, people mentioned a side effect 42 times (about 16 per 100 reports). The most common: jitteriness, anxiety, insomnia. User reports show what people notice — they can't tell you whether Ephedrine is safe for you.
“This morning I had about 200mg of caffeine with ephedrine pre-workout because I didnt get the best sleep last night. I could not focus at ALL today at work.”
“Something that worked great for me was Ephedrine through chewing Ephedra-Tea from China. I quit though because... made me kind of cold.”
“Seriously, this wakes you up in the morning. Best workout I have had in a while. New bench press PB, and felt very focused.”
“Both times it was effective in that my appetite was suppressed and I had plenty of energy. The weight-loss was regular, but I did feel jittery and unsettled at times.”
“structurally ephedrine is an amphetamine and works with similar mechanisms as Adderall. My concern would be large spikes in blood pressure, which can be quite dangerous.”
“I used it for over a year without stopping (stupidly). He is correct about the down-regulation but I never noticed any negative sides personally.”
Conclusion: There was no evidence that hypertension, bradycardia or neonatal endpoints were affected. Phenylephrine reduced the risk for hypotension and nausea and vomiting after spinal doses of bupivacaine generally exceeding 8 mg, but there was no evidence that it reduced other maternal or neonatal morbidities.