Are low libido and an inability to orgasm (for a woman) issues that could be treated with medicine?

Possibly: This depends on the reasons for the decreased libido and lack of orgasm. Some medical conditions can cause or contribute to these symptoms (depression, diabetes, dyspareunia, chronic pain, etc). Decreased libido can also be associated with a low testosterone level, which can also affect the female sexual response, impeding orgasm. Many times these problems are treatable, with good results.

Often yes: Low blood testosterone in women is one cause which can result in inability to achieve orgasm, this can be corrected with testosterone gel. An other treatable cause is low blood estrogen, as in meopause. Certain medications, especially taken for depression can supress libido and ability to achieve orgasm, these could be changed if this cause is suspected.