I don't care anymore. (just kidding)

Currently, there are no proven effective treatments for apathy — no pills or special therapies — but structured activities and opportunities for socialization are a useful approach. A regular routine, continuing to socialize and exercise even if you don’t feel like it, taking your medications on time every time and avoiding isolation all help manage apathy. Talking to your family and friends or taking part in a support group may also help you to stay engaged and motivated.

People experiencing apathy are encouraged to meet with their doctor to:

Evaluate and optimize PD medications — better movement may reduce apathy.
Get tested for depression and apathy — standard rating scales can help you and your doctor find the cause of your mood. If you have depression, get treatment.
Discuss ways to get the most restful sleep possible — sleep difficulties contribute to fatigue.
Explore other treatment options — there are no approved medications to treat apathy, but some people may benefit from cholinesterase inhibitors (medicines that block the breakdown of the enzyme acetylcholine, such as rivastigmine, etc.), stimulants or certain types of antidepressants.
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I push myself to exercise. I do aerobics 3 days per week and walk my dog 1 to 1 1/2 miles every day. This helps my mood and improves my fatigue.