Duct tape is at least as effective as traditional cryotherapy for removal of wart.
Focht et al  conducted a randomized controlled trial to compare effect of duct tape vs cryotherapy on warts. 61 patients were enrolled and divided into two groups. One received cryotherapy (liquid nitrogen) every 2-3 weeks for a maximum of 6 treatments or untils wart resolution. The other group had duct tape applied on the wart in 6-day intervals for 2 months. The study found that duct tape was more effective treatment: 85% of patients using duct tape had their warts completely resolved versus 60% of those treated with cryotherapy.
In a recent study done by De Haen group , researchers compared duct tape with placebo. There data showed that 16% of patient had disappearance of wart compared to 6% in placebo group. They however concluded that duct tape had modest resolution of wart resolution and diameter reduction compared to placebo.
Duct tape also offers cost-effective and less painful option to treat warts. One may get skin irritation. Do check with your doctor before using it for yourself.
- Focht Dr et al. “The efficacy of duct tape vs cryotherapy in the treatment of verruca vulgaris (the common wart)”. Arch Pediatr Adol Med. 2002. 156: p971-4
- de Haem M, Spigt MG et al. “Efficacy of duct tape vs placebo in the treatment of verruca vulgaris (warts) in primary school children.” Arch Pediatr Adolesc Med. 2006 Nov; 160(11):1121-5.