Other effects include headache, nausea, vomiting, abdominal pain, diarrhea, dizziness, collapse or convulsions. Breathing carbon monoxide causes headache, dizziness, vomiting, and nausea. Sulfasalazine may cause stomach upset, nausea, vomiting, loss of appetite, headache, dizziness, or unusual tiredness. Such allergic reactions produce rashes, nausea, diarrhea, dizziness, and localized edema. Common side effects include nausea, dizziness, and hallucinations. Others produce more serious symptoms of lightheadedness, dizziness and fainting. Common side effects include nausea, headaches, dizziness, and trouble concentrating. Injection side effects include skin rash, itching, chills, fever, hot flushes, nausea and dizziness. Side effects of phenibut include sedation, sleepiness, nausea, irritability, agitation, dizziness, and headache, among others. May cause headaches, dizziness and fainting. The same pressure can cause headaches, dizziness, and nausea. Symptoms include headache, fatigue, stomach illness, dizziness, and sleep disturbance. Meclizine is effective in inhibiting nausea, vomiting, and dizziness caused by motion sickness. Common side effects include headache, dizziness, and sleepiness. Common side effects include headache, diarrhea, dizziness, and cough.