Huge Crashes on Medication

Hey guys, so I've been taking medication (Elvanse) for around 6 months now. Most of the time it's all good, I can focus on tasks and I'm enjoying work and being able to focus more etc.

Sometimes, however, I get these massive crashes after work where I just can't seem to function anymore. I'll come home from work and I can barely hold a thought together let alone a conversation with my partner.

Has anyone else here go through something similar? If so, any tips on how to mitigate it or deal with it?