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THE BIRTH CONTROL SPONGE
INTRODUCTION
The Sponge is part of the Barrier group of birth control methods.
Some of the other Barrier methods are:
Unisex, Female, Male Condoms
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Cervical Cap
FemCap
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Diaphragms
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Ovès Cap
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Dumas, Vimule
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Lea contraceptive
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Barrier methods prevent Fertilization , which is the union of the egg and sperm. They provide a mechanical barrier between the sperm and the egg.
Most barrier methods, like the Sponge, are used together with a spermicide. A Spermicide is a chemical substance which kills sperm.
There is one important thing you should know about Barrier methods and Spermicides. They are the only methods of birth control that are able to offer you some protection against Sexually Transmitted Diseases (STDs).
Of course, only Continuous Abstinence can fully protect you from STDs. Continuous Abstinence means no sexual activity at all.
THE BIRTH CONTROL SPONGE
The Sponge is a little disc, made of soft polyurethane foam that comes pre-treated with spermicide.
The foam has a consistency similar to that of vaginal tissue. Because of this, neither you nor your partner will be able to feel the sponge during sex.
One size fits all, so no fitting is required. This means the sponge is available without a doctor's prescription, and you can buy it over-the-counter.
All Sponge brands are disposable--you use a sponge only once and then throw it away.
The Sponge starts to work immediately after it's inserted and lasts for many hours--12 to 24 hours, depending on which brand you use. You are protected for this entire period of time, regardless of how many times your partner ejaculates.
The Sponge prevents a pregnancy by:
blocking the passage of sperm into the cervix
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trapping sperm
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releasing spermicide (a sperm-killing substance)
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To insert the sponge: you introduced it deep into the vagina, so that it fits over the cervix. You can insert it up to 22 hours before intercourse.
To remove the sponge: you pull on foam slots, or grasp it between two fingers (depending on the brand used) and gently withdraw it from the vagina.
You must leave the sponge in place at least 2 to 6 hours after the last time you have sex, to allow time for the sperm to be killed. However, don't leave it in beyond the maximum recommended time.
There is no need to re-apply spermicide, regardless of how many times your partner ejaculates.
The overall 1st year failure rate and the percentage of women who continue to use the sponge after 1 year are:
Sponge*
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1st Year Failure Rate
Perfect Use Typical Use
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1 Year Continuation Rate
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Nulliparous women
(women who have not given birth)
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9% 20%
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56%
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Parous women
(women who have given birth)
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20% 40%
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42%
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*The specific failure rates are listed under the individual Sponge brands.
If your partner uses a condom, the sponge's ability to protect you against an unintended pregnancy is greatly improved.
PROTECTION AGAINST SEXUALLY TRANSMITTED DISEASES (STDs):
The sponge is able to offer you some protection against STDs because of the spermicide it contains. Recall that a spermicide is a chemical substance which kills or inactivates sperm. Some spermicides are also able to kill or inactivate the organisms that cause STDs.
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There are 3 spermicides used in birth control sponges:
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Nonoxynol 9 (N-9)
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Benzalkonium chloride (BZK)
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Sodium cholate
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N-9
Offers no protection against most STDs and, in higher concentrations, increases the risk of HIV transmission. HIV is the virus that causes AIDS.
BZK
Has microbicidal activity--it kills the organisms that cause STDs, including HIV. BZK is widely used as a disinfectant. Studies have also shown that it tends to cause less vaginal irritation than N-9.(1)
Sodium cholate
Is antiviral.
Since a Spermicide is a chemical substance, it can cause irritation to the lining of the vagina. This is important, because the organisms that cause STDs can enter your body through an irritated vaginal lining.
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For example, studies have shown that the spermicide N-9, used frequently and for long periods of time, causes v aginal irritation. This is the reason why, if you use products that have a high dose of N-9, you have an increased risk of HIV infection.
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Because of this evidence, the latest recommendations regarding the use of spermicides containing N-9 are:
products containing N-9 should not be used at all to protect against STDs, including HIV
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if you are considering using products containing N-9 you should be aware of, and should carefully consider the proven risk of using N-9 vs. any potential birth control benefits
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Advantages of using the Sponge:
no fitting required
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no prescription needed
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easy to insert and remove
no wide-spread body effects
you can use it if you've recently given birth
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woman- controlled method
you can leave it in for up to 24 hrs, so it doesn't interfere with spontaneity
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neither you, nor your partner can feel the sponge
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possible protection against STDs
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you only use it when you needed
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immediate return to fertility
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no need to add spermicide
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you can use it if you are breastfeeding
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Disadvantages of using the Sponge:
can not be used if you have an abnormal Pap, genital lesions or infections
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some brands can not be used immediately after childbirth, miscarriage or termination
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higher failure rate vs. other methods
can not be used during your menstrual period
small risk of Toxic Shock Syndrome(TSS)**
some brands may be messy because they have a lot of spermicide
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can not use if allergic to spermicide
must feel comfortable with touching genital area
for brands containing N-9, increased vaginal irritation, which is a risk factor for HIV infection
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**TSS - a small risk of TSS is associated with the use of all Barrier methods, as well as with no birth control use. TSS is a generalized body infection, which occurs in women, men and children and which may be potentially fatal.
There are 4 brands of Sponges, but only the first 2 are currently available:
PHARMATEX Sponge
a foam cylinder impregnated with 60 mg of the spermicide Benzalkonium chloride (BZK)
may be inserted up to 22 hours before sex
do not remove it for at least 2 hours after the last act of vaginal intercourse
do not leave sponge in for more than 24 hours
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The 1st year Failure rate is 19% with typical use.*
*regardless if you had, or have not had children
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The Pharmatex sponge was introduced in 1984, in Europe. It is not yet FDA approved in the U.S.
Pharmatex is currently available.
STDs Protection: Yes, partial protection. (1)
N.B. Until large-scale clinical studies are available, this sponge should not be relied upon to offer protection against STDs, especially HIV.
Advantages
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Disadvantages
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does not require water before insertion
shorter exposure to
spermicide
does not contain N-9
may be used while
breastfeeding
may be used after a recent vaginal delivery, or termination
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some users may be sensitive to the spermicide
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Because Pharmatex contains BZK, and based on the available literature Pharmatex is recommended as a birth control method.
References:
1. Mauck CK; Baker JM; Barr SP; Abercrombie TJ; Archer DF.A phase I comparative study of contraceptive vaginal films containing benzalkonium chloride and nonoxynol-9. Postcoital testing and colposcopy.Contraception 1997 Aug;56(2):89-96
PROTECTAID Sponge
a foam disc impregnated with 5,000 mg of the spermicidal F-5 gel
F-5 gel contains 6.25 mg of Nonoxynol 9 (N-9), 6.25 mg of Benzalkonium chloride (BZK) and 25 mg of Sodium cholate
may be inserted up to 6 hours, but no less than 15 minutes, before sex
do not remove it for at least 6 hours after the last act of vaginal intercourse
do not leave sponge in for more than 12 hours
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The 1st year Failure rate is 23% with typical use.*
*regardless if you had, or have not had children
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The Protectaid sponge was introduced in 1996, in Canada, and in 2000 in Europe. It is not yet FDA approved in the U.S.
Protectaid is currently available.
STDs Protection: Possibly, partial protection.
N.B. Until large-scale clinical studies are available, this sponge should not be relied upon to offer protection against STDs, especially HIV.
- Laboratory studies show that the Protectaid sponge inactivates HIV, Chlamydia and Trichomonas.(2)
- In human studies, the F-5 gel did not cause vaginal irritation up to 12 hours after insertion. The manufacturer also states that the F-5 gel can help prevent irritation caused by intercourse (because the gel forms a protective coating on the wall of the vagina).
- Since the F-5 gel produces less vaginal irritation and because it contains a low concentration of N-9, it is possible that using the Protectaid sponge would not be associated with the harmful effects observed with the use of N-9 alone, in higher concentrations. Also, because this gel contains the microbicidal BZK, and because no increase in STDs, including HIV, was noted in clinical studies, it is possible that the Protectaid sponge offers partial STD protection.
Advantages
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Disadvantages
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does not require water before insertion
lower spermicidal concentration reduces vaginal irritation, a risk factor for HIV infection
may be able to prevent irritation caused by sexual intercourse
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may only be left in place for 12 hours
not as extensively studied as the Today sponge
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Because Protectaid contains BZK and a low dose of N-9, and based on the available literature Protectaid is recommended as a birth control method.
If you wish to order* the Protectaid sponge:
*These links are provided strictly as a courtesy to our visitors. We have not test-purchased any products from these sites, and are unable to offer an informed recommendation about their services. Please do your own evaluation before you decide to buy.
References:
1. Mauck CK; Baker JM; Barr SP; Abercrombie TJ; Archer DF.A phase I comparative study of contraceptive vaginal films containing benzalkonium chloride and nonoxynol-9. Postcoital testing and colposcopy.Contraception 1997 Aug;56(2):89-96
2. Psychoyos, A. Protectaid®: a new vaginal contraceptive sponge with anti-STD properties. In: Mauck C, et al., ed.Barrier Contraceptives: Current Status and Future Prospects New York: Wiley-Liss (1994), pp. 265-270
3. Creatsas G, et al. A multinational evaluation of the efficacy and acceptability of the Protectaid contraceptive sponge.Eur J Contracept Reprod Health Care 2001 Sep;6(3):172-82
TODAY Sponge
a foam disc impregnated with 1,000 mg of the spermicide Nonoxynol-9 (N-9)
you have to wet it with water before insertion
may be inserted up to 24 hours before sex
do not remove it for at least 6 hours after the last act of vaginal intercourse
do not leave sponge in for more than 30 hours
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The estimated 1st year Failure rate is 17% with typical use:
14% for nulliparous women
27% for parous women
* According to the manufacturer, failure rates, with perfect use are 9 % for nulliparous women, and 11 % for parous ones.
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The Today sponge was introduced in 1983, in the U.S. but it was taken off the market* in 1995. It is also approved for use in Canada.
Today is currently not available on the market. It is expected to return, possibly by the end of 2003 in the U.S.
As of March 1, 2003 it should be available in Canada.
*The removal was prompted by issues unrelated to the sponge itself (the cost of needed upgrades at the production factory prompted the manufacturer to discontinue production). The current manufacturer is in the process of obtaining FDA certification for the production facility. The Today Sponge itself has been, and remains, FDA approved in the U.S.
To read the 1995 FDA statement about the removal:
FDA Report
STDs Protection: None
In addition, N-9, the spermicide in the Today sponge, has been shown to increase the risk of HIV transmission.
Advantages
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Disadvantages
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may be left in place for 30 hours
extensively studied
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requires water before insertion
sulfa allergy may preclude use
contains a high concentration of N-9 (increased risk of vaginal irritation, a risk factor for HIV infection)
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Because the Today sponge contains a high concentration of N-9 (1,000 mg), and based on the documented lack of STDs protection coupled with the increased HIV transmission risk associated with the use of N-9, we can not recommend this type of sponge for use as birth control.
If you are interested in further readings on the topic of N-9 and the lack of STDs protection:
- Van Damme L. (2000). Advances in topical microbicides. 13th International AIDS Conference, July 9-14, 2000, Durban, South Africa (Abstract WeOr62).
- Hoffman T, Taha TE, Martinson F et al. Adverse health event occurring during an N-9 Gel pilot study: Malawi. 13th International AIDS Conference, July 9-14, 2000, Durban, South Africa (Abstract no. TuPpC1171)
If you do decide to use the Today sponge, the
manufacturer
has a listing of on-line sites and stores where you can purchase it.
The price for a 12-pack of the Today sponge is ~USD $36.00.
AVERT Sponge
The Avert sponge is currently being developed.
It has a much lower concentration of spermicide ( 100 mg of N-9). Also, there is no need to wet it before insertion.
General References
1. APGO Contraception Monograph, February 1999.
2. Rosenberg MJ, Feldblum PJ, Rojanapithayakorn W, et al. The contraceptive sponge's protection against Chlamydia trachomatis and Neisseria gonorrhoeae. Sex Transm Dis 1987;14(3):147-52.
3. Kreiss J, Ngugi E, Holmes K, et al. Efficacy of nonoxynol 9 contraceptive sponge use in preventing heterosexual acquisition of HIV in Nairobi prostitutes. JAMA 1992;268(4):477-82.
4. Family Health International; Trussell.
5. Colin P, Creatsas G, Serfaty D, et al. Multinational, open phase II study of the efficacy, safety and acceptability of the Protectaid contraceptive sponge. Annual meeting of the Society of Gynecologists and Obstetricians of Canada, Ottawa, Canada, June 1999.
Copyright 2001-2004 GHO. All rights reserved.
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