STD Home > Tri-Norinyl Side Effects

Some of the common side effects of birth control pills (such as Tri-Norinyl) include nausea, headaches, and bloating. Many of these side effects improve within the first few months of using Tri-Norinyl. Side effects of this birth control pill, however, can also be serious and should be reported to a healthcare provider right away. Some of these serious Tri-Norinyl side effects include vision changes, allergic reactions, and chest pain.

An Introduction to Tri-Norinyl Side Effects

As with any medicine, Tri-Norinyl® (norethindrone/ethinyl estradiol) can cause side effects. However, not every woman who uses the contraceptive will experience side effects. In fact, most women tolerate it quite well. If side effects do occur, in most cases, they are minor and either require no treatment or are easily treated by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with Tri-Norinyl. Your healthcare provider can discuss a more complete list of Tri-Norinyl side effects with you. Tri-Norinyl is equivalent to Aranelle™ and Leena® birth control pills. The information in this article applies to both of these medications as well.)

Birth Control and Clinical Trials

In the United States, medications must be shown to be safe and effective in clinical studies before they are approved. In clinical studies for most medications, one group of people receives the actual medication, while another group is given a placebo (a "sugar pill" that does not contain any active ingredients). Typically, the people in the studies do not know if they are taking the real medication or the placebo.
The side effects in both groups are carefully documented and statistically analyzed. As a result, it is possible to see what side effects occur, how often they appear, and whether they are actual side effects of the medication. However, it is not usually ethical to use a placebo in clinical trials for contraceptives, as this would lead to many unintentional pregnancies.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
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