The darker, brown shade of spotting is due to the prolonged retention of blood in the genital tract, which leads to its oxidation and change in color. This is a natural phenomenon with less heavy and less intense bleeding or spotting, which can occur when using hormonal contraception. Irregular spotting is also a typical effect of using Slinda. Over time, withdrawal bleeding often disappears completely, leaving only occasional spotting.

According to the manufacturer of Slinda: "The occurrence of withdrawal bleeding (defined as bleeding that begins within 4 days while using placebo pills and lasts up to 8 consecutive days) was most common in the first cycles – withdrawal bleeding occurred in less than 40% of women using single-component pills and this frequency decreased during the study. After 9 months of using the pills, withdrawal bleeding was reported in less than 20% of the women using the pills."

In conclusion, this is not a cause for concern and does not require a visit to the gynecologist.

I am attaching a link to the article about single-component tablets:

https://www.gdziepolek.pl/kategorie/tabletki-antykoncepcyjne-jednoskladnikowe

I also attach a thread in which patients shared their opinions about Slinda:

https://www.gdziepolek.pl/opinie-i-pytania/22556/slinda-jakie-sa-opinie-o-leku-slinda