Vomiting and nausea are very common side effects of Neosoralen Forte and are generally not signs of a serious medical emergency. This medication frequently causes stomach upset. To help prevent this, try taking the medicine with food or a glass of milk.\n\nHowever, because you vomited, the medication may not have been fully absorbed, which can affect your scheduled UV light therapy. Please contact your dermatologist before your next treatment session to inform them. Seek immediate medical attention if the vomiting is severe, persistent, or accompanied by severe abdominal pain.