As the name implies, primers dimerize mainly due to complementarity - either due to self complementarity of a single primer or complementarity due to primers designed for opposite strands. When designing primers choose low values (0-5 bases) for self complementarity or pair complementarity. Also, minimize high GC content at the 3' end of the primer, this stabilizes the primer binding. These steps usually minimize primer dimer formation, but will also minimize the number of primers that are suggested by the software. Other factors can play a part as well, these steps should prevent dimer formation significantly.
As the name implies, primers dimerize mainly due to complementarity - either due to self complementarity of a single primer or complementarity due to primers designed for opposite strands. When designing primers choose low values (0-5 bases) for self complementarity or pair complementarity. Also, minimize high GC content at the 3' end of the primer, this stabilizes the primer binding. These steps usually minimize primer dimer formation, but will also minimize the number of primers that are suggested by the software. Other factors can play a part as well, these steps should prevent dimer formation significantly.
Hi, there was many reasons for that , of course you have to be sure that your primers were good choosen and cheked, i advice you to pick other primers for your PCR, take care about the complementarity of your primers, also about their lenght.