"You shouldn't really go above 100mg Ephedrine a day, so it's best to start out with smaller dosages and work your way up.
Your Ephedrine tablets' dosages are will determine how often to administer it during the day.
For instance, my tablets are 25mg each, therefore I'd take a maximum of 4 tablets a day.
With each Ephedrine tablet you should dose your caffeine in a 1:10 ratio. So for a 25mg tablet 200mg of caffeine is enough."
For the aspirin, use roughly 300mg per serving of EC e.g.
Ephedrine - 25mg
Caffeine - 200mg
Aspirin - 300mg
Space out your dosages by at least 3 hours.
Some guys say you can use it indefinitely (as the fat-loss effects of the stack don't degrade) but you will build up tolerance to the stimulatory effects, so maybe cycle it in 6-8 week blocks.
Have you used any stimulants like ECA before? If you have any heart/cardiovascular issues, DO NOT use this stack!