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We present a spectroscopic monitoring of the transient nova V4745 Sagittarii(Nova Sgr 2003 #1) covering ten months after the discovery. During this periodthe light curve showed well expressed transient phase in the form of sixrebrightenings, and the presented dataset is one of the best spectroscopiccoverages of a classical nova during the transition phase. Low- andmedium-resolution spectra revealed that the majority of spectral lines switchedback to strong P-Cyg profiles during the mini-outbursts, similar to the spectrajust after the major eruption. We interpret the observed phenomena as evidencefor ``echo-outbursts'' resulting in episodes of secondary mass-ejections andpropose that the transition phase in classical novae is driven by repetitiveinstabilities of the hydrogen shell burning on the surface of the white dwarf.  From the available light curve data we estimate the absolute magnitude of thesystem of about -8.3 +/- 0.5 mag. All spectrophotometric pieces of evidencepoint toward a very low (E(B-V) < 0.1) interstellar reddening, leading to arough distance estimate of V4745 Sgr (9 kpc < d < 19 kpc).Comment: 8 pages, 10 figures, A&A accepte

Spectroscopic monitoring of the transition phase in nova V4745 Sgr