Uses as a Drug

Penlac is an antifungal medication that serves as a topical treatment for onychomycosis, which is otherwise known as fungus of the fingernails and toenails.


Before applying Penlac on affected areas, remove loose nails or loose nail materials using nail clippers. Straighten the edges with a nail file. Apply Penlac on affected nails once a day. Use the provided applicator brush to make it easy to apply evenly over each nail. It is most convenient to apply Penlac during bedtime. Make sure the lacquer dries first before you put on socks or any covering for your hands or feet. It will only take 30 seconds for the lacquer to dry. Wait for 8 hours before washing off the formula and taking a bath or shower.

Safety Precautions

Make sure that you use Penlac only on nails and adjacent skin. Do not get the medication in contact with your eyes or mouth.

Missed Dose

Apply Penlac as soon as you remember. However, it is still best to apply the medication before bedtime so that you will get a natural 8 hours before washing it off.

Side Effects

Penlac’s known side effects are rash related. Immediately call your doctor if you notice the area of application display signs of irritation, such as burning, blistering, itching, oozing, redness and swelling.

Drug Storage

Store Penlac at room temperature preferably between 59 and 86 degrees Fahrenheit (15 and 30 degrees Celsius). Keep in a place that cannot be reached by children.


It is unlikely that you will experience an overdose of this medication. However, if you do suspect an overdose or ingestion, call for emergency medical help at once.

Other Information

Do not use nail polish while being treated with Penlac. The medication is flammable. So, do not expose your medication or your treated nails to heat or flame.