Women taking the birth control Taytulla may end up with an unexpected pregnancy due to a manufacturing error in the order in which they were packaged.

On May 29, the pharmaceutical company that manufactures Taytulla, Allergan, issued a nationwide recall of nearly 170,000 sample packs. The affected products come from lot 5620706 with an expiration date of May 2019, and have been floating around in healthcare offices since August of last year.

The typical order of the birth control pills should be 24 pink pills with hormones, followed by 4 placebo pills without. The 28-pill packs have placebo pills where the active pills should be.

Allergan said in a press release, “The reversing of the order may not be apparent to either new users or previous users of the product, increasing the likelihood of taking the capsules out of order. If patients have concerns regarding the possibility of an unintended pregnancy they should consult their physician.”

Though Allergan issued letters to patients and asked they make arrangements with their healthcare provider to return the product, it may not be that easy for some.

Birth control pills need to be taken on a daily basis at the same time for optimum effectiveness. According to the Mayo Clinic, missing even one day can put the user at risk of contraceptive failure and unintended pregnancy.

Time is of the essence: missing a day of Taytulla could have farther reaching complications for women who have difficulty finding transportation to their doctor, or making an appointment to receive a new prescription.

Allergan released Taytulla in 2016. It is the first soft gel capsule estrogen/progestin combination contraceptive on the market. Other than unintended pregnancy, in this case, Taytulla is known to have other side effects.

Those include headaches, nausea, breast tenderness, bacterial vaginitis, abnormal cervical smear, acne, mood swings, weight gain, vaginal candidiasis and menstrual cramps. Patients with uncontrolled hypertension, or hypertension with vascular disease are not recommended to take Taytulla.

Consumers with question can contact Allergan by phone at 800-678-1605 between 8am and 8pm EST Monday through Friday.

Consumers can also contact the Food and Drug Administration here if they experience adverse problems with Taytulla through the FDA MedWatch Program Adverse Event Reporting Program either online, by mail or fax.