There are no drug interactions for normal capsules or eye drops, but the extended release capsules should not be taken with drugs that affect stomach acid like proton pump inhibitors or with alcohol, as they can cause the drug to be released too quickly. It doesn't inhibit any cytochrome P450 enzymes.
Cysteamine
Carnitine
Nicotinamide
Inositol
Homocysteine
Choline
3-Methylhistidine
Fructosamine