Dermatological: flushing, sweating, acne vulgaris
Gastrointestinal: anorexia, nausea
Genitourinary: decreased urination due to vasoconstriction of renal arteries. Also, difficulty urinating is not uncommon, as alpha-agonists such as ephedrine constrict the internal urethral sphincter, mimicking the effects of sympathetic nervous system stimulation.
Nervous system: restlessness, confusion, insomnia, mild euphoria, mania/hallucinations (rare except in previously existing psychiatric conditions), delusions, formication (may be possible, but lacks documented evidence) paranoia, hostility, panic, agitation
Respiratory: dyspnea, pulmonary edema
Miscellaneous: dizziness, headache, tremor, hyperglycemic reactions, dry mouth
Being a Doctor i still think loosing weight by exercise is the best method, i know that some people are genetically predisposed to weight gain, me included but drugs like these can spoil your heart over the long term.
Do consult your doctor and do this under supervision if you decide to go with it.