Imo, if you're not aleady addicted to opiates, I'd stay the fuck away from them for something comparatively mild as Valerian WD should be. What are you using the Valerian for, and have you tried any other herbal or supplemental remedies, like chamomile or melatonin?
Regarding your loperamide dosage question the previos BLers nailed it, start low, maybe 20mg, but remember that depending on circumstances the full effect may only set in after three or four hours, but will also last a whole.day, so redose slowly until you feel comfortable, then reduce your daily dose from there. I find tapering like this excellent for opiate WDs, but do yourself a favour and Don't trade a Valerian habit for junk addiction, that would be a very bad choice indeed.
On a side note, I reckon a minute amount of lope does cross the BBB if large doses are taken, otherwise it wouldn't eliminate WDs as completely, opiate naive people wouldn't catch a dirty high at 100mg and cause addiction and withdrawals just like any other opiate, if taken in high doses for a long time.
But of course, we'd need to know the reason(s) for taking the Valerian to give better advice. There really may be herbs you've probably never even heard of before which work very well for different conditions.
