Product image of Methoxsalen Macopharma (Methoxsalen) supplied by GNH India

Methoxsalen Macopharma

Active Ingredient:
Methoxsalen
Origin:
EU

Methoxsalen Macopharma (Methoxsalen)

Methoxsalen, the active ingredient in Methoxsalen Macopharma, is a psoralen presented as a pharmaceutical preparation for extracorporeal use. It is employed in photochemotherapy to treat skin disorders such as psoriasis and vitiligo by enhancing the effect of UVA radiation. The drug is supplied in a sterile form suitable for controlled clinical protocols.

GNH India supplies Methoxsalen Macopharma as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide. The company adheres to stringent quality standards and provides regulatory documentation for cross‑border distribution.

Manufacturer / TM Owner

Maco Pharma

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Indications & Clinical Uses

Methoxsalen is a psoralen used in phototherapy protocols that target hyperproliferative and depigmented skin conditions, enhancing the therapeutic effect of UVA exposure.

  • Psoriasis: reduces keratinocyte proliferation and improves plaque lesions when combined with UVA (PUVA) therapy.
  • Vitiligo: promotes repigmentation of depigmented patches by stimulating melanocyte activity under UVA exposure.

How It Works

  • Methoxsalen intercalates between DNA base pairs, and upon activation by UVA radiation forms covalent cross‑links with pyrimidine residues. These DNA adducts inhibit DNA synthesis and cell division, leading to decreased epidermal proliferation and modulation of melanocyte function, which underlies its efficacy in conditions such as psoriasis and vitiligo. The effect is localized to treated skin areas, minimizing systemic exposure and allowing controlled dosing.

Side Effects

Methoxsalen may cause a range of adverse reactions, varying from mild to severe, particularly when combined with UVA exposure.

Common Side Effects

  • Nausea: transient feeling of sickness after administration.
  • Headache: mild to moderate head pain.
  • Skin erythema: redness at the treated area.
  • Itching: localized pruritus.

Serious or Rare Side Effects

  • Severe phototoxic reaction: blistering and extensive skin damage.
  • Hepatotoxicity: significant elevation of liver enzymes.
  • Stevens‑Johnson syndrome: rare severe skin and mucous membrane reaction.

Precautions & Warnings

When using Methoxsalen, several precautions should be observed to minimize risks and ensure safe administration.

  • Assess liver function: perform baseline hepatic enzyme tests before therapy.
  • Avoid excessive sun exposure: protect untreated skin from natural UV light.
  • Monitor blood counts: regular CBC to detect possible hematologic effects.
  • Review concomitant photosensitizers: discontinue or adjust other UV‑sensitive medications.
  • Store at ambient temperature: keep in original container, protect from moisture and light.

Avoid Interactions

Methoxsalen can interact with other medicines, altering its efficacy or increasing toxicity; awareness of these interactions is essential.

Major Interactions (Avoid)

  • Other photosensitizing agents: tetracyclines, sulfonamides, and thiazides may amplify phototoxicity.
  • Systemic retinoids: isotretinoin can increase skin sensitivity and risk of severe reactions.

Moderate Interactions (Monitor Closely)

  • Anticoagulants: warfarin may require INR monitoring due to potential hepatic effects.
  • Oral contraceptives: efficacy may be reduced; consider alternative contraception.
  • Antifungal azoles: ketoconazole may affect methoxsalen metabolism.

Frequently Asked Questions

Methoxsalen Macopharma is used as a photosensitizing agent in PUVA (psoralen plus UVA) therapy to treat skin disorders such as psoriasis and vitiligo. It enhances the therapeutic effect of UVA radiation, helping to reduce plaque formation in psoriasis and to stimulate repigmentation in vitiligo.

Methoxsalen intercalates into DNA and, when activated by UVA light, forms covalent cross‑links with pyrimidine bases. These cross‑links inhibit DNA synthesis and cell proliferation, leading to reduced epidermal growth in psoriasis and modulation of melanocyte activity that supports repigmentation in vitiligo.

The dosage of Methoxsalen Macopharma is determined by the prescribing clinician based on the specific condition, patient characteristics, and treatment protocol. Only a qualified healthcare professional can set the appropriate dose and schedule for each individual patient.

Safety data for methoxsalen in pregnancy and lactation are limited, and the drug is generally classified as contraindicated or to be used only if the potential benefit justifies the risk. Women who are pregnant, planning pregnancy, or breastfeeding should discuss alternatives with their healthcare provider.

To place an order, submit an enquiry on the product page at gnhindia.com specifying the required quantity. GNH India works with hospitals, pharmacies and procurement teams worldwide, verifies trade or institutional credentials, and then provides pricing, availability, shipping details (including any cold‑chain requirements) and the necessary import documentation.

Methoxsalen is one of several psoralens used in PUVA therapy; another common agent is 8‑methoxypsoralen (Trioxsalen). Both have similar mechanisms, but methoxsalen is more widely used in Europe and has an established safety profile. Choice between agents often depends on regional practice, formulation availability, and specific patient tolerance.

Methoxsalen Macopharma should be stored at ambient temperature, below 25 °C, in its original packaging. The container must be kept closed, protected from moisture and direct light to maintain stability. No refrigeration is required for this extracorporeal preparation.

The product is intended for extracorporeal use. Typically, a measured dose is applied topically to the skin surface or administered systemically shortly before exposure to a controlled UVA light source. The timing and method of administration are defined by the treating physician’s protocol.

Serious risks include severe phototoxic reactions such as blistering and extensive skin damage, hepatotoxicity indicated by marked liver enzyme elevations, and rare but life‑threatening conditions like Stevens‑Johnson syndrome. Patients should be monitored closely for any signs of these reactions during and after treatment.

Methoxsalen is contraindicated in patients with a history of severe photosensitivity, active skin cancers, uncontrolled liver disease, or known hypersensitivity to psoralens. It should also be avoided in individuals taking other strong photosensitizing medications unless the prescriber determines that benefits outweigh risks.

Published by

GNH India Pharmaceuticals Limited

Licensed pharmaceutical supplier

Last updated:

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