First of all, a transdermal patch is a drug delivery system applied directly to the skin. It releases the Active Pharmaceutical Ingredient (API) in a controlled and continuous way, which is then absorbed through the skin to reach the bloodstream. This method helps ensure steady dosing, improves treatment adherence, and reduces certain side effects associated with oral medications. When used according to health authority guidelines, transdermal patches provide a safe and effective therapeutic option.
Here are 10 key questions to help you better understand how they work and how to use them properly.
1. How can I tell if the patch is properly applied and working?
Make sure the patch is firmly attached to the skin, with no edges lifting or folds. The skin should be clean and dry, without cream or lotion, to ensure good adhesion.
Keep them in their original packaging, at room temperature, away from light and moisture, and out of reach from children and pets. This helps preserve their integrity and effectiveness.
3. How should a transdermal patch be disposed of after use?
According to the recommendations of the French National Agency for Medicines (ANSM), a used patch should be folded in half with the adhesive sides together, and hands should be washed immediately afterward. The patch should then be returned to a pharmacy collection system to avoid any risk of accidental exposure and to protect the environment. Used patches must be kept out of reach from children and pets and should never be thrown into the wild or flushed down the toilet.
4. Can a patch be cut without affecting its effectiveness?
Sometimes a transdermal patch may loosen or fall off before the recommended duration. In this case, it is important not to reuse the fallen patch, as its effectiveness may be compromised. Instead, apply a new patch to clean, dry, and non-irritated skin, following the treatment instructions.
It is not recommended to apply a patch to irritated, damaged, or wounded skin. This can worsen irritation and affect the effectiveness of the treatment. It is better to select another area of healthy, clean, and dry skin for application.
7. Are patches resistant to water, showering, or sweating?
Most patches are designed to withstand moderate exposure to water (such as a quick shower). However, prolonged baths, excessive sweating or friction can reduce adhesion. It is best to protect the patch during these activities.
8. Can I continue wearing a patch after the expiration date on the package?
It is important not to use a transdermal patch after the expiration date indicated on its packaging. Beyond this date, the effectiveness of the medication may be reduced, as the amount of active ingredient can decrease over time. In addition, the safety of the product is no longer guaranteed, which may increase the risk of skin irritation or other side effects. To ensure a safe and effective treatment, always use a patch that is within its expiration date.
Using a patch at the same time as another medication may alter its effectiveness, increase the risk of side effects, or lead to an inappropriate dosage. To minimize these risks, it is important to inform your doctor and pharmacist about all ongoing treatments, including over-the-counter medications. They can check for compatibility, adjust the treatment if needed, or advise on precautions to take.
If you notice a side effect not mentioned in the leaflet or experience a serious reaction, consult your doctor so they can evaluate the situation and propose an appropriate solution. You may also seek advice from your pharmacist. Remember that any suspected adverse reaction can be reported directly by patients or patient associations to regional pharmacovigilance centers.
When in doubt:
Never hesitate to consult your pharmacist or doctor if you have any question or concern about using a transdermal patch. Their expertise is there to support you and ensure safe and optimal use.
ANSM: French National Agency for Medicines and Health Products Safety