side effects from allegra
Some common side effects of Allegra include nausea, diarrhea, upset stomach, muscle or back discomfort or pain, sleepiness, headache, and menstrual cramps.ess serious side effects may include: 1  nausea, diarrhea, upset stomach; 2  menstrual cramps; 3  drowsiness, tired feeling; 4  headache; or.