Symptoms of postpartum depression are similar to what happens normally following childbirth. They include difficulty sleeping, appetite changes, excessive fatigue, decreased libido, and frequent mood changes.
If your horse needs a topical medication along with a pain reliever, your veterinarian may have you apply a dimethyl sulfoxide, or DMSO, solution. DMSO is quickly absorbed through the skin and is especially good at relieving swelling, as it pulls moisture from tissues.
In the USA, hydrocodone bitartrate/acetaminophen preparations (Vicodin, Lortab, Norco, Vicoprofen) are the most common opiate prescribed to manage 'moderate' pain. Some practitioners go with codeine/acetaminophen (Tylenol #3, Tylenol #4) or tramadol (Ultram, Ultracet) instead.