Directions: For maximum protection and efficacy, apply Certain Dri® to each underarm before bed. Certain Dri® Prescription Strength Clinical works while you sleep, to stop sweating before it starts. To reduce the risk of irritation, be sure underarms are completely dry before applying.

Certain Dri® Prescription Strength Clinical helps stop excessive sweating for up to 72 hours. NEW LOOK! Certain Dri® Prescription Strength Clinical helps stop excessive sweating for up to 72 hours.

Ingredients : Active Ingredient: 25% Aluminum Sesquichlorohydrate (Anhydrous). Inactive Ingredients: cetyl alcohol, cyclopentasiloxane, fragrance, glyceryl stearate (and) PED-100 stearate, hydrogenated castor oil, mineral oil, stearyl alcohol, talc.

To sum it up, this product is effective at blocking underarm sweat, but be aware of the potential side effects. It may permanently block your underarm sweat glands while redirecting sweat to other areas. Consider whether sweating more from your face and torso is preferable for you.

Most deodorants and antiperspirants offer 24- to 48-hour protection, so you shouldn't have to apply multiple times during the day.

Our top picks

• Best overall/editor's pick: Secret Clinical Strength Invisible Antiperspirant & Deodorant.
• Best stick: Degree Ultra Clear Pure Clean Antiperspirant & Deodorant.
• Best aluminum-free: Dove 0% Aluminum Deodorant.
• Best natural: Native ​​Regular Deodorant.

Certain Dri Roll VS Solid The roll-on is considered as their best product and has 12% of the active ingredient required to help with excessive sweating. The solid on the other hand, is a clinical strength version with 25% of the necessary active ingredient - although that's more than what's needed to achieve results.

Aluminium chlorohydrate Aluminium chlorohydrate and aluminium zirkonium tetrachlorohydrate glycine complex are the most frequently used active ingredients in commercial antitranspirants today. Aluminium chloride and propantheline bromide, the anticholinergic substance, are important alternatives although less common.

Aluminium chloride, aluminium chlorohydrate, and aluminium-zirconium compounds, most notably aluminium zirconium tetrachlorohydrex gly are frequently used in antiperspirants. Aluminium chlorohydrate and aluminium-zirconium tetrachlorohydrate gly are the most frequent active ingredients in commercial antiperspirants.

Our top picks

• Best overall/editor's pick: Secret Clinical Strength Invisible Antiperspirant & Deodorant.
• Best stick: Degree Ultra Clear Pure Clean Antiperspirant & Deodorant.
• Best aluminum-free: Dove 0% Aluminum Deodorant.
• Best natural: Native ​​Regular Deodorant.

Side effects include: Local skin irritation (burning, stinging, itching, tingling).

Antiperspirant temporarily blocks your sweat glands to prevent sweat and is safe to use as a daily solution to sweat and stink.