Less serious side effects include: 1  Loss of appetite. 2  Weight loss. 3  Nausea. 4  Vomiting. 5  Diarrhea. 6  Frequent urination. 7  Muscle cramps, painful and swollen joints. 8  Excessive tiredness. 9  Difficulty falling asleep. 10  Headache, nervousness, dizziness. 11  Depression, mood swings. 12  Vivid dreams.
Nausea can occur in dogs for many reasons, particularly when the digestive tract and nervous systems are out of balance. Stress can certainly play a role in nausea.
In most cases, you'll give your pet three doses of equal size each day. Dramamine is not safe for dogs that have stomach upset or certain other disorders or conditions like glaucoma. It's also possible that your pet might experience some type of allergic reaction to the drug. In these cases, it's most likely that you'll find one or more of the following symptoms: 1  Vomiting or diarrhea.