However, I have both from the actual pharma and have previously used compounded 4-AP.
Compounded 4-AP is MUCH cheaper than Ampyra/Fampridine and was very effective for my spasticity and ataxia. I got my GP to write up the script in 5mg slow release capsules (ie you don't need your neuro).
However, I think I have personally noticed that the Modafinil recently actually makes my ataxia worse.
As a cheap and easy alternative to Modafinil, you may like to also try Ritalin. I use 5mg quick release tablets for when I want to work out. But slow release tablets are available also. They are really comparatively cheap. I pay about $AUD184 for Modafinil 100x60, and $AUD27 for 100x5mg for Ritalin.
Ritalin is very powerful, but I noticed I built up tolerance very quickly, it is also an addictive drug. The first time you try it, start on a lower dose, as it feels very strong when your body is new to it, but it really lifts the fatigue. But I would probably recommend Modafinil for long term regular usage just on a safety profile.
You may also wish to look into ardafinil (your body turns it into Modafinil), as I think its cheaper, and I have even seen it for sale without prescription. You may also wish to look into high dose Thiamine ( http://www.thisisms.com/forum/natural-a ... 22785.html ) or Sulbutiamine ( http://www.thisisms.com/forum/general-d ... 26487.html )