Ok, I have vyvanse 70 mg tablets. Currently I have been on them for 3 days alotogether. I take the pill when i want to, I've takin 3 pills in one week. My first quesiton (1. Is it safe to take vyvanse when needed? If not what are the harms of it and is it very severe or no?. (2. MY BIG CONCERN. Its a love hate situation for me so far, i love what it does, the concentrating, the happy mood, love it! But I'm having awful side effects. The first day i had none.