A female client taking a liquid iron preparation expresses concern that her tooth color has darkened since starting the medication. Which action should the practical nurse (PN) implement?

Teach the client to use a straw when taking the medication to reduce further tooth staining.

Reassure the client that this change indicates the medication is having the desired effect.

Determine if the client is also experiencing mouth or gum pain and difficulty swallowing

Advise the client to withhold further doses until consulting with the healthcare provider.