Are there any side effects from using Revitalash?

Typically eyelash products have similar side effects such as, redness, irritation and itching. There should be an information sheet within the package to educate you on the product. Any further questions I would contact the provider or manufacturer of the product. 

Latisse is the only FDA-approved product for growing longer, darker, and fuller eyelashes. The active ingredient requires a prescription so there are no over-the-counter substitutes. 

Revitalash is not an FDA-approved product. But general side effects would be eye irritation, redness, skin discoloration, itching, or swelling. Those are pretty general for any eye products. "This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."