You'll almost certainly be alright, keep track of your status and call a nurse/teladoc to see if you need medical assistance. The most important thing is you stay calm and don't let your panic take over.

https://www.drugs.com/dosage/lisdexamfetamine.html

Here is some online information I found, I can't tell you how accurate it will be for you, but it seems that a max dosage is at least 70mg, and if I'm reading it correctly, that's for pediatric cases.

My wife (who is ADHD) said vitamin c , orange juice for example. Apparently it reduces the uptake. Your advised not to have orange juice because it can interfere with the uptake

You're going to be fine. Just relax and don't stress.

If you are concerned, poison control can give expert advice.

You might get pretty uncomfortable but you will be ok. Been there, same dose

I’m on a 60 mg dose daily. You’ll be ok.

Lethal dose of amphetamine in healthy humans is like 20mg per kg body weight. How have you been feeling so far, you okay?

Keep calm, the first time I doubled up I was so stressed about blood pressure that my freaking out spiked my blood pressure (I'm on methylphenidate, myself). Doubling prescriptions is never good but, aside EoL oncology meds, dosages are usually set to never be close to the range for immediate toxicity.

Your head might be funny feeling today but you can make it through.

Others have said you'll be fine but another thing I thought about was that you'll be missing a pill for 1 day lol,

Doctors can prescribe up to 70mg doses of Elvanse, so you shouldn't overdose. If necessary seek medical attention, but most likely you'll just notice it come on much more since you still seem to be trying to find the right dose for you. If you weren't noticing anything on 30mg then you might see some positive effects at 60mg, but you should work with your doctor to find the right dose for you, taking more than prescribed once is a mistake, doing it regularly might be seen as abuse of a controlled drug.

I'm late but you wanna call poison control in this situation. The wait time is very short, and they're super nice. I recently had a similar situation. They called me every few hours to check on me after giving me instructions. If you have an iPhone, you can tell Siri to call poison control. The number is built in.