Can i use neosporin cream (neomycin and polymyxin b) for stitches?

No problem: Depending on where the laceration is... Keep neosporin out of the eyes and mucous membranes.

Can do: Depends really on what the injury/procedure and dressing placed initially. Assuming it was a simple cut that was sutured, sure, neosporin will be fine. Sometimes more elaborate dressings are used containing silver etc, so wouldn't be necessary then.

Not a fan: 15% of population has a skin rash to neomycin, one of the 3 antibiotics in neosporin. I prefer Bacitracin or polymixin.

Is ok: I generally use a silver dressing.