Itchsol1%+3%

Established Uses

Itchsol is an over-the-counter topical combination indicated for the temporaryrelief of itching, pain, and minor skin irritation associated with:

• Insect bites and stings
• Minor cuts, scrapes, and abrasions
• Poison ivy, poison oak, and poison sumac reactions
• Sunburn and minor thermal burns
• Minor skin rashes and other minor skin irritations

These are established, monograph-recognized over-the-counter external analgesic/antipruriticuses. Itchsol is not indicated for deep wounds, puncture wounds, animal bites,serious burns, or infected skin, and it is not an antibiotic or antiseptic.

Pramoxine Hydrochloride + Calamine is a topical preparation combining two active ingredients in a singlelotion, cream, or gel base:

• Pramoxine Hydrochloride - a topical local anesthetic (typically around 1% w/w)
• Calamine - a mild astringent and skin protectant (a zinc oxide-based compoundwith a small amount of ferric oxide, typically in the range of 3-8% w/w)

Exact strengths vary by manufacturer and dosage form; refer to the specific product label forthe precise concentration of each ingredient.

Itchsol is a fixed-dose topical combination used for short-term symptomaticrelief of itching and mild skin discomfort. Pramoxine hydrochloride is a local anesthetic that ischemically distinct from the 'caine'-type (ester or amide) anesthetics such as benzocaine orlidocaine, which gives it a reduced risk of cross-sensitization in people who are allergic tothose agents. Calamine acts as a mild astringent and protectant that dries weeping or oozing skinlesions, forms a soothing protective film, and helps reduce irritation. Together, theseingredients provide temporary relief of itching (pruritus) and minor pain from superficial skinirritation. Itchsol is available without a prescription and is intended forshort-term, external use only.

Itchsol belongs to the therapeutic class of topical externalanalgesics/antipruritics combined with a topical skin protectant/astringent, used forthe symptomatic management of minor itching and skin irritation.

Mechanism of Action

Pramoxine Hydrochloride + Calamine combines two complementary mechanisms:

• Pramoxine hydrochloride is a surface-acting local anesthetic that stabilizesneuronal cell membranes and reversibly blocks the initiation and conduction of nerve impulsesalong sensory nerve fibers in the skin, which interrupts the transmission of itch and painsignals. Structurally it is an ether-type compound, unlike the amide/ester ('caine') localanesthetics, which accounts for its low cross-reactivity in patients sensitive to those drugs.
• Calamine exerts a mild astringent and protective effect on the skin surface.It has weak drying and soothing properties, helps reduce local inflammation and weeping, andforms a physical barrier that shields irritated skin from further trauma.

Systemic absorption of both components through intact skin is minimal whenPramoxine Hydrochloride + Calamine is used as directed on limited areas of skin.

Itchsol is for topical (external) use only and must never be swallowed, usedin the eyes, or applied inside the mouth or nose. Wash and dry the affected area before eachapplication. Apply a thin layer and gently spread over the irritated skin; there is no need torub in vigorously. Reapply after bathing or swimming if the treated area has been washed. Keep thecontainer tightly closed and away from heat when not in use.

No clinically significant systemic drug-drug interactions have been well established forItchsol when used topically as directed, owing to its minimal systemicabsorption through intact skin. As a precaution:

• Avoid applying other topical anesthetic, antihistamine, or antiseptic products to the sameskin area at the same time as Itchsol, as this may increase local irritation oradditive anesthetic absorption.
• Applying Itchsol over large areas of broken or denuded skin may increasesystemic absorption and the theoretical potential for interaction with other systemic medicines;this should be avoided (see Contraindications and Precautions).

Adverse effects with Itchsol are usually mild and limited to the applicationsite. These may include:

• Transient burning, stinging, or tingling sensation immediately after application
• Local dryness or mild irritation of the skin
• Temporary pink/chalky discoloration of the skin or staining of clothing/fabric (from thecalamine component)
• Allergic contact dermatitis or rash (uncommon, but discontinue use if this occurs)

Seek medical advice if irritation, redness, or swelling worsens or spreads, or if signs of anallergic reaction (such as hives, facial swelling, or difficulty breathing) occur.

Itchsol is applied topically and, when used as directed on limited areas ofintact skin, systemic absorption is minimal. Formal controlled studies in pregnant orbreastfeeding women are lacking. As with any medicine used during pregnancy or lactation,Itchsol should be used only if clearly needed, on the smallest area and for theshortest duration necessary, and only after consulting a physician, so that potential benefit isweighed against any potential risk. If breastfeeding, avoid applying Itchsol tothe breast/nipple area to prevent accidental ingestion by the infant.

• Itchsol is for external use only; avoid contact with the eyes, and rinsethoroughly with water if accidental eye contact occurs.
• Do not apply to deep or puncture wounds, animal bites, large areas of damaged skin, orinfected skin (see Contraindications).
• Discontinue use and consult a physician if irritation, redness, or rash worsens, spreads, orpersists beyond 7 days.
• Avoid use over large areas of the body surface or for prolonged periods without medicalsupervision, as this may increase systemic absorption of the local anesthetic component.
• Keep out of reach of children; accidental ingestion requires prompt medical attention (seeOverdose).
• Do not bandage tightly (occlusive dressing) over treated skin unless directed by a physician,as this can increase absorption.

Overdose with topically applied Itchsol is unlikely when used as directed onlimited areas of intact skin. Accidental ingestion, or use over very large areas of broken skin,may increase absorption of the pramoxine hydrochloride component and could theoretically causesymptoms such as dizziness, drowsiness, nausea, or vomiting. If Itchsol isaccidentally swallowed, or if excessive absorption is suspected (e.g., unusual drowsiness,bluish discoloration of the skin/lips, or difficulty breathing after extensive use), seekimmediate medical attention or contact a poison control center right away. Do not attemptspecific home treatment beyond removing residual product from the skin and seeking professionalcare.

Store at room temperature (below 30°C), away from light and moisture. Keep the container tightly closed. Keep out of reach of children.

• Elderly: No specific dose adjustment is established for elderly patientsusing Itchsol topically; general precautions for external use apply.
• Renal/hepatic impairment: Because systemic absorption ofItchsol through intact skin is minimal, no specific dose adjustment isestablished for patients with renal or hepatic impairment; caution is still advised if used overlarge areas of broken skin.
• Children: See Pediatric Uses below.

Itchsol is intended for short-term, as-needed use for temporary relief ofitching and minor skin irritation. If symptoms persist beyond 7 days, worsen, or recur soon afterstopping treatment, discontinue use and consult a physician, as an alternative diagnosis ortreatment may be needed. Itchsol is not intended for long-term or continuous usewithout medical supervision.

External Analgesic/Antipruritic (Topical Local Anesthetic); Topical Skin Protectant/Astringent

In Pramoxine Hydrochloride + Calamine, pramoxine hydrochloride works by stabilizing the neuronal membraneof cutaneous sensory nerve fibers, blocking sodium-channel-mediated initiation and conduction ofnerve impulses and thereby reducing the transmission of itch and pain signals from the skin.Calamine works by a physical/astringent mechanism rather than a pharmacologic receptormechanism: it mildly dries and coagulates surface proteins on irritated or weeping skin, forms aprotective film, and provides a soothing, cooling sensation that helps reduce the urge toscratch.

Itchsol is generally considered appropriate for use in children 2 years ofage and older, applied as a thin layer to the affected area up to 3 to 4 times daily, consistentwith standard over-the-counter labeling for topical antipruritic/analgesic combinations. Forchildren under 2 years of age, safety and efficacy have not been separately established, and aphysician should be consulted before use in this age group. As with adults, use in childrenshould be limited to small, intact areas of skin, avoiding the eyes and mucous membranes, and aphysician should be consulted if irritation worsens or persists.