Wednesday, July 06, 2005

Transdermal Birth Control

Jessica, at feministing, has an update on spray-on (metered-dose transdermal spray, or MDTS) birth control.

Here's a good review of transdermal birth control methods:


Patch (Ortho Evra)


Spray-on

Description: Patches, sprays, or gels, applied weekly or daily, that transfer hormones through the skin.

Stage of development: One product marketed.

Effectiveness: Patches—0.8 to 1.3 pregnancies per 100 women in the first year as typically used.

How they work: Patches release estrogen and progestin through the skin, preventing ovulation, thickening the cervical mucus, and suppressing endometrial growth.

What’s new? Patches require attention just once a week. Used correctly at higher rates than combined OCs. Sprays or gels transfer fast-drying progestins onto the skin. They are absorbed immediately and diffuse into the bloodstream.

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4 Comments:

At 9:22 PM, Anonymous Anonymous said...

I found the patch to be dirty. After just a few hours of wear, the sides were black and fuzzy, it really grossed me out. They also don't stay in place as well as the commercials make you think. I was trying on some clothes and came home to find the patch stuck to the inside of my shirt.

 
At 3:24 AM, Anonymous Anonymous said...

An Ortho drug rep recommended that, after placing the patch, one take a small amount of cornstarch powder and rub over the top of the patch. Any edges that are gummy will absorb the powder and not dirt; this leaves edges cleaner looking....

 
At 3:53 AM, Anonymous Anonymous said...

Why must the patch be changed every 7 days? Why not leave it on for the full 3 weeks? It would be more convenient and cheaper? Any other reasons other than business?

 
At 8:24 PM, Anonymous Anonymous said...

Why must the patch be changed every 7 days? Why not leave it on for the full 3 weeks? It would be more convenient and cheaper? Any other reasons other than business?

The patch cannot be left on for three weeks for a few reasons:

1) The adhesive would have to be strong enough to stick for three weeks without falling off.

2) Skin irritation. You must change locations of the patch every week.

3) Most importantly, a 3-week dose on one single patch would need too much medication in it. It would deliver much too strong a dose the first week, and too weak a dose the third week.

 

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