chap 15: Drugs affecting the the Central Nervous System Flashcards
Sarah, a 42-year-old female, requests a prescription for an anorexiant to treat her obesity. A trial of phentermine is prescribed. Prescribing precautions include:
- Understanding that obesity is a contraindication to prescribing phentermine
- Anorexiants may cause tolerance and should only be prescribed for 6 months
- Patients should be monitored for postural hypotension
- Renal function should be monitored closely while on anorexiants
- Anorexiants may cause tolerance and should only be prescribed for 6 months
Before prescribing phentermine to Sarah, a thorough drug history should be taken including assessing for the use of serotonergic agents such as selective serotonin reuptake inhibitors (SSRIs) and St John’s wort due to:
- Additive respiratory depression risk
- Additive effects affecting liver function
- The risk of serotonin syndrome
- The risk of altered cognitive functioning
- The risk of serotonin syndrome
Antonia is a 3-year-old child who has a history of status epilepticus. Along with her routine antiseizure medication, she should also have a home prescription for_________ to be used for an episode of status epilepticus.
- IV phenobarbital
- Rectal diazepam (Diastat)
- IV phenytoin (Dilantin)
- Oral carbamazepine (Tegretol)
- Rectal diazepam (Diastat)
Rabi is being prescribed phenytoin for seizures. Monitoring includes assessing:
- For phenytoin hypersensitivity syndrome 3 to 8 weeks after starting treatment
- For pedal edema throughout therapy
- Heart rate at each visit and consider altering therapy if heart rate is less than 60 bpm
- For vision changes, such as red-green blindness, at least annually
- For phenytoin hypersensitivity syndrome 3 to 8 weeks after starting treatment
Dwayne has recently started on carbamazepine to treat seizures. He comes to see you and you note that while his carbamazepine levels had been in the therapeutic range, they are now low. The possible cause for the low carbamazepine levels include:
- Dwayne hasn’t been taking his carbamazepine because it causes insomnia.
- Carbamazepine auto-induces metabolism, leading to lower levels in spite of good compliance.
- Dwayne was not originally prescribed the correct amount of carbamazepine.
- Carbamazepine is probably not the right antiseizure medication for Dwayne.
- Carbamazepine auto-induces metabolism, leading to lower levels in spite of good compliance.
Carbamazepine has a Black Box Warning due to life-threatening:
- Renal toxicity, leading to renal failure
- Hepatotoxicity, leading to liver failure
- Dermatologic reaction, including Steven’s Johnson and toxic epidermal necrolysis
- Cardiac effects, including supraventricular tachycardia
- Dermatologic reaction, including Steven’s Johnson and toxic epidermal necrolysis
Long-term monitoring of patients who are taking carbamazepine includes:
- Routine troponin levels to assess for cardiac damage
- Annual eye examinations to assess for cataract development
- Monthly pregnancy tests for all women of childbearing age
- Complete blood count every 3 to 4 months
- Complete blood count every 3 to 4 months
Six-year-old Lucy has recently been started on ethosuximide (Zarontin) for seizures. She should be monitored for:
- Increased seizure activity, as this drug may auto-induce seizures
- Altered renal function, including renal failure
- Blood dyscrasias, which are uncommon but possible
- Central nervous system excitement, leading to insomnia
- Blood dyscrasias, which are uncommon but possible
Sook has been prescribed gabapentin to treat neuropathic pain and is complaining of feeling depressed and having “strange” thoughts. The appropriate initial action would be:
- Increase her dose
- Assess for suicidal ideation
- Discontinue the medication immediately
- Decrease her dose to half then slowly titrate up the dose
- Assess for suicidal ideation
Selma, who is overweight, recently started taking topiramate for seizures and at her follow-up visit you note she has lost 3 kg. The appropriate action would be:
- Tell her to increase her caloric intake to counter the effects of the topiramate.
- Consult with a neurologist, as this is not a common adverse effect of topiramate.
- Decrease her dose of topiramate.
- Reassure her that this is a normal side effect of topiramate and continue to monitor her weight.
- Reassure her that this is a normal side effect of topiramate and continue to monitor her weight.
Monitoring of a patient on gabapentin to treat seizures includes:
- Routine therapeutic drug levels every 3 to 4 months
- Assessing for dermatologic reactions, including Steven’s Johnson
- Routine serum electrolytes, especially in hot weather
- Recording seizure frequency, duration, and severity
- Recording seizure frequency, duration, and severity
Scott’s seizures are well controlled on topiramate and he wants to start playing baseball. Education for Scott regarding his topiramate includes:
- He should not play sports due to the risk of increased seizures
- He should monitor his temperature and ability to sweat in the heat while playing
- Reminding him that he may need higher dosages of topiramate when exercising
- Encouraging him to use sunscreen due to photosensitivity from topiramate
- He should monitor his temperature and ability to sweat in the heat while playing
Cara is taking levetiracetam (Keppra) to treat seizures. Routine education for levetiracetam includes reminding her:
- To not abruptly discontinue levetiracetam due to risk for withdrawal seizures
- To wear sunscreen due to photosensitivity from levetiracetam
- To get an annual eye exam while on levetiracetam
- To report weight loss if it occurs
- To not abruptly discontinue levetiracetam due to risk for withdrawal seizures
Levetiracetam has known drug interactions with:
- Combined oral contraceptives
- Carbamazepine
- Warfarin
- Few, if any, drugs
- Few, if any, drugs
Zainab is taking lamotrigine (Lamictal) and presents to the clinic with fever and lymphadenopathy. Initial evaluation and treatment includes:
- Reassuring her she has a viral infection and to call if she isn’t better in 4 or 5 days
- Ruling out a hypersensitivity reaction that may lead to multi-organ failure
- Rapid strep test and symptomatic care if strep test is negative
- Observation only, with further assessment if she worsens
- Ruling out a hypersensitivity reaction that may lead to multi-organ failure