Pharmacology of Sleep, Seizures, Thyroid, and Cholesterol Drugs

Temazepam (Restoril)

Used for: short-term insomnia — that's it, nothing else. It helps you fall asleep faster and wake up less during the night. It's a pill taken at bedtime, only when you actually need it (PRN), and it's not meant for long-term use. Watch for: "complex sleep behaviors" — driving, eating, or walking around while essentially asleep, with zero memory of it afterward. If that happens, stop the drug and call the provider.

Diazepam (Valium)

Used for: the most versatile of the three — anxiety, muscle spasms, seizures (including status epilepticus, which is a medical emergency), alcohol withdrawal, and sedation before procedures. Because it's used for so many things, it comes in more forms (oral, rectal, IM, IV). If it's given IV, it has to go in slowly, and you need emergency equipment nearby just in case. It's genuinely dangerous for a fetus, especially the IV form — it should never be given during labor and delivery. Watch for: IV is teratogenic and contraindicated right before/during delivery. Also — the emulsion form is IV only, never IM.

Lorazepam (Ativan)

Used for: anxiety and, importantly, stopping an active seizure — it's a go-to drug for status epilepticus. IV dosing is stricter: push it slowly (no faster than 2 mg/min), and keep the patient lying flat for at least 8 hours afterward, because it can drop blood pressure and slow breathing. Watch for: Respiratory depression and hypotension after IV dosing — that's why the 8-hour flat-lying rule exists.

Zolpidem (Ambien)

Used for: short-term sleep problems only — it's basically the non-benzo version of temazepam. It hits the same GABA receptors as benzodiazepines but isn't chemically one. It's meant for short stretches (max 7-10 days), and you should only take it if you actually have a full 7-8 hours available to sleep — taking it and then getting up early is when the weird sleep behaviors tend to happen. Watch for: Same "sleep driving/eating with no memory" risk as temazepam. Also — avoid in older adults, since it raises their risk of confusion, delirium, and falls more than it does in younger people.

Phenytoin (Dilantin)

Used for: controlling seizures. It works by blocking sodium channels in the brain, which stops a seizure from spreading once it starts. The signature side effect to know is gingival hyperplasia — the gums swell and overgrow — so good dental hygiene is a real teaching point here, not just a throwaway line. Give it with food, but keep antacids away from it by at least 2-3 hours since they block absorption. Watch for: Nystagmus (eye flickering), unsteady walking, and slurred speech are early signs the drug level is getting too high — assess for these before dosing when you can.

Valproic Acid (Depakene)

Used for: seizures, but also bipolar mania and preventing migraines — it's a multi-purpose drug. It works by boosting GABA (the calming chemical) and quieting down sodium/calcium channel activity. The three big red flags with this one are liver damage, pancreatitis (belly pain, vomiting, no appetite), and high ammonia levels, which can cause confusion. It's strongly linked to birth defects, so it's a hard no in pregnancy. Watch for: Any new abdominal pain, jaundice, or unusual bruising/bleeding needs to be reported right away — those point to the liver, pancreas, or blood problems this drug can cause.

Pregabalin (Lyrica)

Used for: both seizures and nerve pain (like diabetic neuropathy), since it calms overactive nerve signals throughout the body, not just in the brain. Unlike phenytoin and valproic acid, pregabalin has some potential for misuse, so it's watched a little more closely for that. It also needs to be tapered off slowly over at least a week — stopping it abruptly can cause withdrawal or rebound seizures. Watch for: Mood changes/suicidal thoughts and unexplained muscle pain or weakness (it can affect muscle enzymes and platelets) are the two things to flag to a provider

Baclofen (Lioresal)

Used for: reducing muscle spasticity — commonly used in conditions like MS or spinal cord injury. It works in the spinal cord rather than the brain, calming down the reflexes that cause muscle spasms. Give oral doses with food or milk to ease stomach upset. Like the CNS drugs above, it should never be stopped suddenly. Watch for: Abruptly stopping it can trigger seizures or severe withdrawal — always taper off gradually

Alendronate (Fosamax)

Used for: osteoporosis — it slows down bone breakdown so bone density can hold steady or improve. It works by making osteoclasts (the cells that break down bone) detach and stop working. The administration instructions are the whole point of this drug on an exam: take it first thing in the morning, on a completely empty stomach, with a full glass of plain water — then stay upright and don't eat, drink, or take anything else for 30 minutes. Watch for: Skipping the "stay upright" rule can cause esophagitis (the pill sits in the esophagus and irritates it). Rarely, this drug is linked to osteonecrosis of the jaw, so dental history matters.

Doxycycline (Vibramycin)

Used for: acne — it's an antibiotic that's also used for this off-label-feeling but very common purpose. It works by disrupting bacterial protein synthesis. Take it with food, and stay sitting upright afterward — same esophagus-irritation logic as alendronate. It also binds to calcium, iron, magnesium, and antacids, so those need to be spaced apart from the dose. Watch for: Esophageal ulceration if the client lies down right after taking it. Also contraindicated in pregnancy.

Isotretinoin (Accutane)

Used for: severe acne that hasn't responded to other treatments. It's a vitamin-A derivative that shrinks the oil (sebaceous) glands so they make less sebum. This is one of the most heavily monitored drugs on the list: baseline liver function, lipid panel, and an eye exam before starting, plus regular mood screening throughout treatment. Watch for: It causes serious birth defects — anyone who could become pregnant needs two negative pregnancy tests before starting and monthly testing during treatment. Also, never combine it with doxycycline (or other tetracyclines)

Levothyroxine (Synthroid)

Used for: hypothyroidism — an underactive thyroid that isn't making enough hormone on its own. It's a synthetic version of T4 that replaces what the thyroid isn't producing, which speeds the metabolism back up to normal. Take it on an empty stomach, same time every day, 30-60 minutes before breakfast — food and a long list of supplements (calcium, iron, magnesium) block its absorption. This is a lifelong medication. Watch for: Taking too much causes hyperthyroid symptoms — racing heart, heat intolerance, weight loss, insomnia. That's the giveaway that the dose needs adjusting.

Methimazole (Tapazole)

Used for: hyperthyroidism. It works by directly slowing down the thyroid's hormone production. The one adverse effect that gets tested constantly is agranulocytosis — a dangerous crash in white blood cells. Teach clients to report sore throat, fever, chills, or mouth sores immediately, since those are early warning signs of infection with a weakened immune system. Watch for: Agranulocytosis (sore throat, fever, mouth sores = call the provider). It can also overshoot into hypothyroidism if the dose is too high, and it's teratogenic.

Radioactive Iodine-131 (Hicon)

Used for: permanently treating hyperthyroidism (Graves' disease, toxic goiter, thyroid cancer) with a single dose. It's radioactive iodine that gets taken up by the thyroid and destroys the overactive tissue from the inside. Clients avoid iodine in their diet for a week beforehand, and afterward they follow radiation-safety precautions because they're temporarily radioactive themselves. Watch for: Most people end up hypothyroid within about a year and need lifelong levothyroxine afterward — which ties all three thyroid drugs together into one story. It's an absolute no in pregnancy/breastfeeding.

Atorvastatin (Lipitor)

Used for: lowering LDL ("bad") cholesterol and preventing cardiovascular events like heart attacks. It blocks the liver enzyme (HMG-CoA reductase) that makes cholesterol in the first place. It's often dosed in the evening because the body actually makes most of its cholesterol overnight. Watch for: Muscle pain, tenderness, or weakness — could be early rhabdomyolysis, especially if combined with a fibrate like gemfibrozil

Gemfibrozil (Lopid)

Used for: lowering triglycerides and raising HDL ("good") cholesterol — that's its main lane, more than LDL. It activates a receptor (PPAR-alpha) in the liver and fat tissue that speeds up triglyceride breakdown. Take it 30 minutes before meals, twice a day. Watch for: Never combine with a statin without close monitoring — together they significantly raise the risk of serious muscle breakdown. Also watch for gallbladder issues (cholelithiasis).

Ezetimibe (Zetia)

Used for: lowering LDL cholesterol, often as an add-on when a statin alone isn't enough. Instead of acting on the liver like the other two, it blocks cholesterol from being absorbed in the intestine in the first place. It's a once-daily pill, and if the client is also on a bile acid sequestrant, doses need to be spaced 2 hours before or 4 hours after. Watch for: Rhabdomyolysis and liver injury risk both climb when it's combined with a statin — report unexplained fatigue, muscle aches, or dark urine.