Gray nails, or onychomycosis, itraconazole for onychomycosis is usually taken orally, can be taken with warm water, need to follow the doctor’s instructions for medication. Tinea cruris is a nail lesion caused by dermatophytes that invade the nail plate and nail bed. Itraconazole belongs to the antifungal drugs, suitable for lichen planus, onychomycosis, candidiasis and so on. Common dosage forms of Itraconazole include granules, capsules, tablets, etc., all of which are oral drugs. It is recommended that patients who need to take Itraconazole for the treatment of onychomycosis should take it with warm water after meals to help the absorption of the drug. Some patients may experience adverse reactions such as dizziness, dyspnea, nausea, liver function abnormalities after taking this product. It should be noted that it is contraindicated for those who are allergic to itraconazole or drug excipients; except for serious, life-threatening infections, it is contraindicated for patients with ventricular dysfunction, such as patients with congestive heart failure; contraindicated for use in combination with a variety of CYP3A4 substrates, common medications, such as azimidazole, imipramine, quinidine and so on. If you need to take itraconazole for the treatment of onychomycosis, it is recommended to go to a regular hospital to consult a doctor, under the guidance of the doctor to use the drug, do not abuse the drug.