Chapter 44: Adult Integumentary Medications

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You know, I feel like usually when we think about the skin, we just, well, we treat it like a wrapper.

Oh, absolutely.

Like packaging.

Right.

Like it's just this static waterproof layer designed to keep our insides in and, you know, the outside world out.

You get a dry patch, you slap a little lotion on it, you get a rash, put some cream on it and you're good to go.

Yeah, it feels completely surface level to most people and honestly that makes it very easy to underestimate in a clinical setting.

Exactly.

But then you step into the world of clinical pharmacology and suddenly that simple wrapper becomes, well, it becomes a highly active, incredibly permeable organ.

Right.

It's, I mean, it is a massive two -way superhighway directly into the bloodstream.

Okay, let's unpack this because today we are taking a deep dive into mastering a really high yield NCLEX topic for you.

We are using the Sonder's Comprehensive Review for the NCLEX -RN examination, specifically Chapter 44, the Integumentary Medication Section.

That's our blueprint today.

And we're also going to take a quick peek at the oncology and hematology pyramid points a bit later on, right?

We are, yeah.

Our mission today is simple.

We really want to build your clinical reasoning because treating the skin, it isn't just about localized fixes.

As we're going to see, topical treatments can have some serious, I mean, even life -threatening systemic effects.

Yeah, that is the core tension we need to explore today.

If you don't respect the permeability of the skin, you can accidentally cause a massive systemic storm.

So here is our game plan.

We're going to walk through this material sequentially.

We'll start from simple, localized irritations and scale all the way up to the heavy -duty life -saving burn products.

Sounds good.

And then we'll actually test your clinical reasoning by breaking down how the NCLEX tests these concepts with the practice questions.

So let's start with superficial inflammation, things like poison ivy and basic dermatitis.

Right.

Clinically, you'll see first -line treatments like calamine lotion, soothing oatmeal baths or, you know, topical corticosteroids for the itching.

Plus maybe some oral diphenhydramine just to help the patient sleep.

Exactly.

It's very common, very straightforward.

For basic atopic or contact dermatitis, you're really looking at moisturizers and topical glucocorticoids as your go -to defense.

But when those don't work, things escalate, right, to second -line treatments.

So we're talking about topical immunosuppressants, specifically creams like tacrolimus and pima crolimus.

Yes.

And clinically, there is a massive safety alert attached to these.

Caregivers are strictly instructed to wear gloves and wash their hands thoroughly before and after administration.

Okay, let's pause there.

Why is that such a critical priority?

Like, is it really that dangerous to just touch the cream?

It goes right back to the skin being a superhighway.

I mean, these drugs are immunosuppressants designed to calm down overactive immune response in the patient's skin.

So if a nurse or even a family caregiver applies that cream barehanded, their own skin absorbs the medication systemically.

The goal is to treat the patient's skin, not to accidentally suppress the caregiver's immune system.

Oh, wow.

So protect yourself first.

Always.

And there are a few other critical warnings about tacrolimus specifically.

Because it suppresses local immunity, it carries a risk of increasing varicella zoster infections.

Like chickenpox.

Yeah, chickenpox in children.

And it also increases the risk of developing skin cancer and lymphoma.

Just from a cream.

Just from a cream.

Think about it.

Your skin's immune cells are constantly patrolling for abnormal cancerous cells.

If you suppress those patrolling cells with tacrolimus, well, abnormal cells can just slip by unnoticed.

That makes total sense.

And it heavily sensitizes the patient's skin to sunlight, too.

So sun protection becomes paramount.

Which perfectly tees up our next major category,

topple glucocorticoids or steroids.

This is really all about understanding absorption and preventing systemic toxicity.

These drugs, they have anti -inflammatory, antipyretic, which means anti -itch and vasoconstrictive actions.

But their potency completely depends on where and how you apply them.

Exactly.

This is where we need to look at what we can think of as a permeability map of the human body.

Right.

Think of your skin like a landscape.

The palms of your hands, the soles of your feet, your back.

Those areas are like concrete.

The medicine just sort of sits on top.

Absorption into the bloodstream there is very low.

Right.

But the face, the neck, the axilla or armpits, the eyelids, the perineum, I mean those areas are like dry sponges.

They will just soak those steroids straight through the dermis and right into the systemic circulation.

Yeah.

In a healthy adult, intact skin is generally a pretty good barrier.

But if you apply steroids to those highly permeable sponge areas, or if you apply them over open wounds, you lose that barrier entirely.

You get undesired systemic absorption.

And what does that systemic absorption actually look like?

Like we know the local effects.

Things like thinning of the skin, striae or purpura, which are those thread -like red lines.

But the systemic effects are heavy.

Very heavy.

Systemic toxicity from topical steroids can cause growth retardation in children, adrenal suppression, Cushing syndrome, and even ocular effects.

Like glaucoma and cataracts, right?

Exactly.

When you flood the body with exogenous steroids, the adrenal glands basically just go to sleep.

Right?

They stop making their own cortisol.

Wow.

So for the nurse who's actually applying the medication, the application technique is a vital safety priority.

You wear gloves, you wash the area first, and then apply it sparingly in a thin film.

Sparingly is the key word there.

But there's also a strict rule against using a dry occlusive dressing,

like wrapping the area tightly in an impermeable bandage, unless the provider specifically prescribes it.

Why does a bandage make such a massive difference?

Because an occlusive dressing creates a greenhouse effect.

It traps heat and moisture, which drastically dilates the blood vessels right at the skin's surface, and that just forces the drug directly into the bloodstream at a much higher, much faster rate.

Okay.

So sparingly, in a thin film, and let it breathe.

Exactly.

Let's shift gears from inflammation to precancerous sun damage, specifically actinic keratosis.

These are those rough scaly lesions caused by prolonged UV exposure.

And if left untreated, they can actually progress to squamous cell carcinoma.

And the medications used to treat them are quite intense, really, because they are essentially trying to destroy the damaged cells.

Diclofenac is a topical NSID, but it can take up to three months to be effective.

That's a long time.

It is.

Then you have fluorosil, which is essentially a topical chemotherapy.

It alters DNA and RNA synthesis to kill the lesions.

So the skin is going to look a lot worse before it looks better.

Oh, absolutely.

Red, blistered, peeling.

And that healing process takes weeks or even months.

There's also imikimod, which incidentally is also used to treat venereal warts, and ingenolmebutate.

And with ingenolmebutate, there is a huge safety risk of severe allergic reactions and the development of herpes zoster.

Which really makes preventing the sun damage in the first place a much better option.

Yeah, prevention is key.

So let's talk about sunscreen.

We know it protects against UVA and UVD rays.

You need at least SPF 15.

You apply it 30 minutes before going out, reapply every two to three hours, and avoid the sun between 10 a .m.

and 4 p .m.

Standard advice, yeah.

But hold on.

I have a massive point of confusion here from the text.

We all know to look out for basic allergies, right?

But there is a very specific clinical warning about a cross -sensitivity with PEPA.

Ah, yes.

Paramino benzoic acid.

It's an ingredient in some sunscreens.

Right.

But why do we care about a sulfate antibiotic allergy when we're just talking about sunscreen?

Like, that doesn't make intuitive sense.

Are patients absorbing that much of it?

Well, it's not just about the absorption amount, it's about the chemistry.

If we look at the chemical structure, PAPA is nearly identical to certain other medications.

Oh, really?

Yeah.

So if a patient's chart says they are allergic to benzocaine, sulfonamides like your sulfate antibiotics or thiazide diuretics, you have to ensure they avoid sunscreens containing PAPA.

Because the body gets confused.

Exactly.

Their immune system doesn't care if it's a pill or a lotion.

It recognizes that chemical shape and it can trigger a full systemic allergic reaction.

Cross -check those sulfon and thiazide allergies before recommending a sunscreen.

That is a brilliant piece of clinical reasoning to just, you know, tuck away.

Okay, let's move deeper into systemic skin issues.

What happens when the threat comes from within?

Like when the skin cells themselves start rebelling and multiplying too fast, that brings us to psoriasis.

Right.

Psoriasis is a chronic inflammatory disorder where the skin cells essentially hyperproliferate.

They just grow way too fast, creating those thick silvery scales.

The whole goal of treatment is to suppress that rapid cell growth without triggering systemic damage.

And the topical treatments have some really fascinating side effects.

For example, calcipotrine is a vitamin D analog and the text notes that high doses can rarely cause hypercalcemia, which is too much calcium in the blood.

Why would a skin cream spike blood calcium?

Well think about what vitamin D does.

Its primary job in the body is to pull calcium from the gut into the bloodstream.

So when you apply massive amounts of a vitamin D analog to the skin, it absorbs systemically and does exactly what vitamin D does.

It drives up serum calcium levels.

Fascinating.

Then you have coal tar, which suppresses DNA synthesis, but it smells terrible, it stains the skin, and can actually increase the risk of cancer in high doses.

Right.

And salicylic acid, which softens the scales, but it can be absorbed systemically and cause a condition called salicylism.

Salicylism.

What does that actually look like?

It's a toxic condition characterized by tinnitus.

So ringing in the ears, dizziness, hyperpnea, and even psychological disturbances.

Salicylic acid is chemically related to aspirin, so the toxicity profile is very similar.

Which reinforces why we don't apply these keratolytic medications to large surface areas or open wounds.

But the systemic psoriasis medications are where the safety warnings really reach critical mass.

Methotrexate is apatotoxic, it causes bone marrow depression, and it's teratogenic.

I really want to look at acetritin.

Oh yes!

A patient taking acetritin has to use two reliable forms of contraception starting a month before treatment, and they have to continue for three years after stopping it.

Three years.

How does a drug linger in the body for three years?

It's intense.

Acetritin is profoundly embryotoxic and teratogenic.

It causes severe fetal abnormalities.

The reason for that three -year window is its pharmacokinetics.

It is highly fat -soluble.

Oh, so it just hides out in the fat.

Exactly.

It gets stored in the body's adipose tissue, and it leeches out incredibly slowly over years.

The risk is so high that a three -year washout period is the absolute standard of care.

And the escalation just continues with systemic biological medications.

Drugs like adalimumab or infliximab, these are injected to block the altered immune system.

And because the immune suppression is so significant, you have to test the patient for tuberculosis before you even start.

I like to think of biologics as, like, shutting down the body's entire security system to stop a local riot in the skin.

If TB is hiding out quietly in the lungs, turning off that security system will just let it loose to wreak havoc.

That's exactly the mechanism.

It's also why they absolutely cannot receive any live virus vaccines.

And they cannot receive the BCG vaccine a year before or a year after treatment.

Their immune system simply cannot mount a defense.

Wow.

Okay, let's pivot to a condition almost everyone has encountered, but whose pharmacology is surprisingly complex.

Acne.

We're looking at escalating treatments here.

For mild to moderate acne, we see benzoyl peroxide.

And there's a quick note to watch out for sulfide allergies there.

Yes.

Then there are topical retinoids like tretinoin and adipoline.

Right.

And with those retinoids, they sensitize the skin to UV light heavily.

So wearing protective clothing and sunscreen is just a mandatory teaching point.

Got it.

There are also oral antibiotics like doxycycline and minocycline, though they can take three to six months to really show improvement.

But then we get to severe acne, which brings us to isocretinoin.

Yes, the heavy hitter.

If you've ever worked in a dermatology clinic, you know prescribing isocretinoin is an absolute administrative nightmare,

but for a very good reason.

Imagine you are reviewing a patient's chart before they start it.

What active medications do you need to immediately cross off their list?

You need to immediately look for and stop vitamin A supplements and tetracycline antibiotics.

Isocretinoin is literally a potent vitamin A derivative.

If they keep taking vitamin A supplements, they will develop severe compounding toxicity.

And combining it with tetracyclines increases the risk of a really dangerous buildup of pressure inside the skull called pseudotumor cerebre.

Yikes.

And just like acetretin, isocretinoin is highly teratogenic.

Extremely.

This introduces the IPLDJ program, which is a mandatory risk management system.

It ensures no one starts the medication pregnant and no one becomes pregnant while on it.

So that's the two forms of birth control, regular negative pregnancy tests.

Exactly.

It's highly regulated because the fetal abnormalities it causes are just catastrophic.

The nurse also has to monitor triglyceride levels because isocretinoin elevates them.

And the patient has to avoid alcohol.

What is the connection between an acne pill, blood fad, and alcohol?

It comes down to the liver.

Isocretinoin is heavily processed in the liver, just like alcohol and dietary fats.

When you introduce this medication, you create a massive metabolic bottleneck.

The liver is so busy processing the drug that triglycerides pile up in the blood.

If you add alcohol to that mix, the bottleneck gets worse, the triglycerides spike even higher, and you risk acute pancreatitis.

Wow.

There's also a strict mandate to monitor for depression.

If depression occurs, the drug is stopped immediately.

Let's just quickly touch on the hormonal options for acne before we move on.

Oral contraceptives are used, but so is spironolactone.

Now, spironolactone decreases sebum production, but it is teratogenic, and it can cause hyperkalemia high potassium.

Why does a drug used for oily skin mess with your potassium levels?

Because spironolactone isn't primarily a skin drug, it's a potassium -sparing diuretic.

It works by blocking aldosterone.

So while that hormonal blockade successfully shrinks the sebaceous glands, its primary action in the kidneys is to excrete fluid while holding onto potassium.

When you alter fluid balance to reduce sebum, you accidentally retain potassium.

It is all connected.

Okay, we are moving to the final major clinical area, burn products.

We need to differentiate between two life -saving burn treatments and recognize their very unique metabolic side effects.

We have silver sulfateazine and mafenyde acetate.

Both are used to prevent sepsis in burn wounds, but they behave very differently systemically.

This is a classic high -yield comparison.

The MCLEX loves to test your ability to distinguish the systemic side effects of these two creams.

Let's do a scenario for you listening.

I have two burn patients in the ICU.

Patient A's white blood cell count is suddenly plummeting.

Patient B is suddenly hyperventilating.

Which burn cream is causing which reaction?

Okay, patient A with the plummeting white blood cells is reacting to silver sulfateazine.

Silver sulfateazine can cause bone marrow suppression, leading to leukopenia.

You have to monitor the CVC frequently.

And patient B, the one hyperventilating.

Patient B is reacting to mafenyde acetate.

Mafenyde acetate is water -soluble, so it diffuses deep through devascularized tissue, but its mechanism is that it acts as a carbonic and hydrates inhibitor in the kidneys.

And what does that do?

This causes the kidneys to aggressively dump bicarbonate, which is the body's primary buffer.

Without bicarbonate, the blood becomes acidic, precipitating metabolic acidosis.

The body tries to compensate for that acidic state by blowing off CO2, hence the rapid hyperventilation.

So if you see hyperventilation, you need to monitor those arterial blood gases.

Exactly.

That is a brilliant breakdown of the why.

Okay.

And clinically,

mafenyde acetate is known to be incredibly painful when applied.

So pain management, medicating the patient beforehand is a crucial nursing intervention.

Precisely.

Anticipating that pain is just as important as anticipating the acid -base imbalance.

We've covered a massive amount of ground, from dermatitis to severe burns.

Now let's put this knowledge to the test.

Let's look at how the NCLEX actually structures questions around this material, and I want you to help me deconstruct the traps a student might fall into.

Let's do it.

Okay, here is a scenario based on the practice questions in the text.

A client with psoriasis is prescribed salicylic acid.

The nurse needs to monitor for systemic toxicity.

The options include things like tinnitus, diarrhea, constipation, or decreased respirations.

Now, my instinct tells me that in nursing school, when in doubt, just guess the GI symptoms like diarrhea or constipation.

Why is that a dangerous assumption here?

Because it ignores the specific pharmacology of the drug.

As we discussed, salicylic acid causes salicylism, which is chemically akin to aspirin toxicity.

The hallmark, classic toxidrome of salicylism, is tinnitus.

The ringing in the ears.

Right, ringing in the ears, along with dizziness and hyperpnea.

The GI symptoms are classic distractors designed to catch students who are just, you know, guessing.

Okay, here's another scenario.

A burn client is receiving treatments of topical mafenyacetate.

The nurse is looking for a systemic effect.

The options include hyperventilation, elevated blood pressure, and a local rash.

A student might see topical cream and immediately jump to local rash.

Well, the key word in the prompt is systemic.

A local rash is, by definition, localized to the application site.

Maffenyacetate as a carbonic anhydrase inhibitor causes metabolic acidosis.

The systemic compensatory response to that acidosis is hyperventilation.

So you have to read the question carefully to separate local reactions from systemic emergencies.

Exactly.

Let's look at one about silver sulfatizine.

The scenario gives us lab values.

A normal glucose level, a normal platelet level, a normal magnesium level, and a white blood cell count of 3 ,000.

My instinct is to ignore the WBC because it's a burn cream, not an immune -suppressing drug.

Why is that wrong?

Because silver sulfatizine specifically causes leukopenia, which is a severe drop in white blood cells.

A normal WBC count is roughly 5 ,000 to 10 ,000.

So 3 ,000 is definitively leukopenia.

Wow.

Even though it's an antimicrobial cream, its systemic side effect hits the bone marrow.

The priority is recognizing that complication so the provider can discontinue the medication.

Okay, let's do one more tricky one.

A nurse is applying a topical corticosteroid to a client with eczema.

Which body areas are safe to apply the medication to?

Options include the back, axilla, eyelids, soles of the feet, palms of the hands.

This goes right back to our permeability map.

We want low absorption areas to avoid systemic toxicity.

The back, soles of the feet, and palms of the hands are the concrete areas.

They are safe.

But the axilla and eyelids?

Those are highly permeable sponges.

Applying steroids there without explicit direction risks massive systemic absorption.

It's so satisfying when the foundational anatomy directly answers the clinical pharmacology question.

Okay, before we wrap up, let's take a quick look ahead at the pyramid points for oncology and hematology.

How do the broad safety principles of cancer care tie into what we've been discussing today?

Well, the clinical priorities remain incredibly consistent.

Whether you're dealing with actinic keratosis, which can lead to skin cancer or a systemic issue like leukemia, the nurse's role is anchored in safety.

That means safe handling of hazardous materials like chemotherapy creams or IV infusions.

It means ensuring advanced directives and informed consent are in place.

It also involves advocating for psychosocial integrity.

Like helping a patient cope with changes in body image.

Yeah, exactly.

Whether from severe acne, burn scars, or hair loss from chemo.

Physiologically, you're constantly monitoring for life -threatening complications, particularly drops in absolute neutrophil count, or ANC, and platelets to prevent infection and bleeding.

It all comes back to anticipating the complication before it happens.

So what does this all mean for you?

We've gone from superficial dermatitis and poison ivy, navigating the strict rules of acne medications like isotretinoin, all the way to severe burns and systemic toxicities.

Treating the skin is never just a surface -level job.

Treating the skin means treating the whole body.

And I want to leave you with a final thought to mull over.

We spend our whole lives thinking of the skin as a shield designed to keep the outside world out.

But as a nurse, you have to completely flip that perspective.

The skin is a highly active, highly permeable two -way street.

The next time you apply a simple lotion, ointment, or cream to a patient, ask yourself,

if this patient's skin acts like a sponge today, what systemic storm am I about to cause tomorrow?

That is a powerful question to keep in your back pocket.

Thank you so much for joining us on this deep dive.

Trust your clinical reasoning, respect the permeability of the skin, and you're going to do great on exam day.

A warm thank you from the Last Minute Lecture team for learning with us, and we'll see you next time.