Most frequent side effects are headache, insomnia, constipation, dizziness, fatigue, nasopharyngitis, changes in libido. As the treatment continues, these effects disappear. In some patients, Qsymia can significantly raise blood pressure and accelerate heart rate, disturb vision clarity, enhance irritability. revatio south africa Contraindications and drug interactions Qsymia is contraindicated in the following conditions and diseases: thyrotoxicosis; acute myopia, glaucoma; severe hepatic and renal impairment; pregnancy and breastfeeding period.