Explain your diagnosis for the patient, including your rationale for the diagnosis. Describe an appropriate drug therapy plan based on the patient’s history, diagnosis, and drugs currently prescribed.

Pharmacotherapy for gastrointestinal and hepatobiliary disorders

The patient presents with a history of chronic headaches, nausea, vomiting and light sensitivity. Based on this information, the diagnosis is likely migraine headache disorder. Migraine headaches are typically unilateral (affecting one side) and pulsating in nature, accompanied by symptoms such as nausea/vomiting and light sensitivity. The patient’s report of chronicity is also consistent with migraine headaches; they last anywhere from 4 to 72 hours and occur at least two times per month up to several times per week or even daily in some cases.

When diagnosing migraine headache disorders it is important to rule out any medical or neurological causes that could be causing the patient’s symptoms – such as an intracranial mass lesion or vascular malformation – so further evaluation may need to be done depending on clinical presentation before starting treatment.

An appropriate drug therapy plan would include acute medications for symptom relief when the migraines cannot be prevented, as well as prophylactic medications for prevention if episodes occur more than 2-3 times a month. For acute treatment options there are triptan drugs (such as sumatriptan), ergot alkaloids (such as dihydroergotamine), antiemetics (such as metoclopramide) and nonsteroidal anti-inflammatories like ibuprofen available for use either orally or via injectable route. Prophylactic therapies include beta blockers (like propranolol), calcium channel blockers (like verapamil), antidepressants (like amitriptyline) and anticonvulsants like topiramate which can provide long-term relief from symptoms and reduce frequency of episodes over time when taken regularly according to prescribed instructions.