Like all medicines, acrivastine can cause side effects in some people, but these won't affect everyone. Common side effects of acrivastine include drowsiness, dry mouth and dizziness, with these symptoms affecting around 1 in 10 people. Products that contain both acrivastine and pseudoephedrine can cause common side effects such as: trouble sleeping, nausea, headaches, nervousness, difficulty peeing (for men), especially those with an enlarged prostate.