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Background The Anti-Her 2 (AH2) drugs [trastuzumab (T.) and ertuzumab (P.)] are essential components in HER2 + Breast Cancer treatment. Although these kinds of therapies represent a breakthrough in different studies, a group of patients (p.) presented left ventricular dysfunction (LVD) in the follow-up. The vast majority recovered the left ventricular ejection fraction (LVEF) after withdrawal of treatment. We analysed prospectively a group of p. who presented a LVD after AH2 treatment. We propose that the early treatment with beta-blockers (BB), angiotensin-converting enzyme inhibitor (ACEI) or angiotensin receptor blockers (ARB), aldosterone antagonist (AA); could help an early recovery of LVEF and allow the reintroduction of the AH2 therapy without a new risk of LVD. Methods We evaluated 587 consecutive p. with HER2+ breast cancer who received T. alone or with P. from January 2017 to August 2018. We evaluated LVEF with ultrasonography (US.) before treatment (t). 43 p. had developed LVD and started t. with BB [Carvedilol (C.], ACEI [Enalapril (E.)] or ARB [Valsartan (V.)], AA [eplerenone (EP.)] at the moment of HF diagnosis and kept under t. after LVEF recovery. AH2 therapies were reintroduced when the patients improved their LVEF. Follow-up was with US.: 30 days, 60 days, 3 and 6 months (m.). We used SPSS for the statistical analysis. Results 43 p. aged 54 +/- 8, 100% female. Risk Factors: arterial hypertension 10 p., diabetes 5 p, dyslipidemia 6 p., smoking 9 p. Previous oncological therapies: doxorubicin - cyclophosphamide 22 p., paclitaxel 22 p. Median of the basal LVEF was 61.4 % and at HF diagnosis was 39.3 %. Patient's New York Heart Association (NYHA) at diagnosis moment class was: I 15 %, II 60% and III 25%. All of the p. stopped the AH2 therapy. HF t. was: C 42 patients, E 33 patients, V. 10 patients and EP. 42 patients. LVEF recovery at 30 days was 81.39 % of p, at 60 days 95.34 %, at 3 and 6 m 97.67 %. When p. recuperated the LVEF we restarted the AH2 therapy. No patients had a new LVD at 3 m. and 6 m.. Patient's NYHA class at 6 m was: I 30%, II 25% and asymptomatic 45%. Conclusions While the LVD related with AH2 therapies is a real problem in HER2+ breast cancer patients’ care, a timely diagnosis and t. with therapies for HF can allow LVEF recovery and specific oncological therapy continuance. Legal entity responsible for the study The authors. Funding Has not received any funding. Disclosure All authors have declared no conflicts of interest.